[ILM] Fix bug when adding to an index template#249168
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SoniaSanzV merged 4 commits intoelastic:mainfrom Jan 21, 2026
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[ILM] Fix bug when adding to an index template#249168SoniaSanzV merged 4 commits intoelastic:mainfrom
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Starting backport for target branches: 8.19, 9.1, 9.2, 9.3 |
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## Summary Elasticsearch's `GET index_template` API returns `created_date_millis` and `modified_date_millis` properties, but these properties are not allowed in `PUT index_template` requests, causing Elasticsearch to reject updates. The fix removes these read-only date properties before sending the template back to Elasticsearch in the PUT request. ### How to test * Go to ILM plugin * Click the tree dots icon in the actions column for some custom policy * Click `Add to index template` * Select an index template and save * The policy should correctly be applied to the index template ### Before this change <img width="1170" height="1070" alt="Screenshot 2026-01-15 at 11 01 29" src="https://github.com/user-attachments/assets/45d86252-4466-4d51-bd1a-75a47cd1b481" /> ### After this change <img width="1296" height="1159" alt="Screenshot 2026-01-15 at 11 42 30" src="https://github.com/user-attachments/assets/6047c7b6-f4d0-4b19-8f23-29ecbf8fcb7a" /> (cherry picked from commit 575e9bb)
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## Summary Elasticsearch's `GET index_template` API returns `created_date_millis` and `modified_date_millis` properties, but these properties are not allowed in `PUT index_template` requests, causing Elasticsearch to reject updates. The fix removes these read-only date properties before sending the template back to Elasticsearch in the PUT request. ### How to test * Go to ILM plugin * Click the tree dots icon in the actions column for some custom policy * Click `Add to index template` * Select an index template and save * The policy should correctly be applied to the index template ### Before this change <img width="1170" height="1070" alt="Screenshot 2026-01-15 at 11 01 29" src="https://github.com/user-attachments/assets/45d86252-4466-4d51-bd1a-75a47cd1b481" /> ### After this change <img width="1296" height="1159" alt="Screenshot 2026-01-15 at 11 42 30" src="https://github.com/user-attachments/assets/6047c7b6-f4d0-4b19-8f23-29ecbf8fcb7a" /> (cherry picked from commit 575e9bb)
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## Summary Elasticsearch's `GET index_template` API returns `created_date_millis` and `modified_date_millis` properties, but these properties are not allowed in `PUT index_template` requests, causing Elasticsearch to reject updates. The fix removes these read-only date properties before sending the template back to Elasticsearch in the PUT request. ### How to test * Go to ILM plugin * Click the tree dots icon in the actions column for some custom policy * Click `Add to index template` * Select an index template and save * The policy should correctly be applied to the index template ### Before this change <img width="1170" height="1070" alt="Screenshot 2026-01-15 at 11 01 29" src="https://github.com/user-attachments/assets/45d86252-4466-4d51-bd1a-75a47cd1b481" /> ### After this change <img width="1296" height="1159" alt="Screenshot 2026-01-15 at 11 42 30" src="https://github.com/user-attachments/assets/6047c7b6-f4d0-4b19-8f23-29ecbf8fcb7a" /> (cherry picked from commit 575e9bb)
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## Summary Elasticsearch's `GET index_template` API returns `created_date_millis` and `modified_date_millis` properties, but these properties are not allowed in `PUT index_template` requests, causing Elasticsearch to reject updates. The fix removes these read-only date properties before sending the template back to Elasticsearch in the PUT request. ### How to test * Go to ILM plugin * Click the tree dots icon in the actions column for some custom policy * Click `Add to index template` * Select an index template and save * The policy should correctly be applied to the index template ### Before this change <img width="1170" height="1070" alt="Screenshot 2026-01-15 at 11 01 29" src="https://github.com/user-attachments/assets/45d86252-4466-4d51-bd1a-75a47cd1b481" /> ### After this change <img width="1296" height="1159" alt="Screenshot 2026-01-15 at 11 42 30" src="https://github.com/user-attachments/assets/6047c7b6-f4d0-4b19-8f23-29ecbf8fcb7a" /> (cherry picked from commit 575e9bb)
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) # Backport This will backport the following commits from `main` to `8.19`: - [[ILM] Fix bug when adding to an index template (#249168)](#249168) <!--- Backport version: 9.6.6 --> ### Questions ? Please refer to the [Backport tool documentation](https://github.com/sorenlouv/backport) <!--BACKPORT [{"author":{"name":"Sonia Sanz Vivas","email":"sonia.sanzvivas@elastic.co"},"sourceCommit":{"committedDate":"2026-01-21T22:54:40Z","message":"[ILM] Fix bug when adding to an index template (#249168)\n\n## Summary\n\nElasticsearch's `GET index_template` API returns `created_date_millis`\nand `modified_date_millis` properties, but these properties are not\nallowed in `PUT index_template` requests, causing Elasticsearch to\nreject updates. The fix removes these read-only date properties before\nsending the template back to Elasticsearch in the PUT request.\n\n### How to test\n* Go to ILM plugin\n* Click the tree dots icon in the actions column for some custom policy\n* Click `Add to index template`\n* Select an index template and save\n* The policy should correctly be applied to the index template\n\n### Before this change\n<img width=\"1170\" height=\"1070\" alt=\"Screenshot 2026-01-15 at 11 01 29\"\nsrc=\"https://github.com/user-attachments/assets/45d86252-4466-4d51-bd1a-75a47cd1b481\"\n/>\n\n### After this change\n<img width=\"1296\" height=\"1159\" alt=\"Screenshot 2026-01-15 at 11 42 30\"\nsrc=\"https://github.com/user-attachments/assets/6047c7b6-f4d0-4b19-8f23-29ecbf8fcb7a\"\n/>","sha":"575e9bbd9501018a90a1812ab5cb17dd9658c592","branchLabelMapping":{"^v9.4.0$":"main","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["bug","release_note:fix","Feature:ILM","Team:Kibana Management","backport:all-open","v9.4.0"],"title":"[ILM] Fix bug when adding to an index template","number":249168,"url":"https://github.com/elastic/kibana/pull/249168","mergeCommit":{"message":"[ILM] Fix bug when adding to an index template (#249168)\n\n## Summary\n\nElasticsearch's `GET index_template` API returns `created_date_millis`\nand `modified_date_millis` properties, but these properties are not\nallowed in `PUT index_template` requests, causing Elasticsearch to\nreject updates. The fix removes these read-only date properties before\nsending the template back to Elasticsearch in the PUT request.\n\n### How to test\n* Go to ILM plugin\n* Click the tree dots icon in the actions column for some custom policy\n* Click `Add to index template`\n* Select an index template and save\n* The policy should correctly be applied to the index template\n\n### Before this change\n<img width=\"1170\" height=\"1070\" alt=\"Screenshot 2026-01-15 at 11 01 29\"\nsrc=\"https://github.com/user-attachments/assets/45d86252-4466-4d51-bd1a-75a47cd1b481\"\n/>\n\n### After this change\n<img width=\"1296\" height=\"1159\" alt=\"Screenshot 2026-01-15 at 11 42 30\"\nsrc=\"https://github.com/user-attachments/assets/6047c7b6-f4d0-4b19-8f23-29ecbf8fcb7a\"\n/>","sha":"575e9bbd9501018a90a1812ab5cb17dd9658c592"}},"sourceBranch":"main","suggestedTargetBranches":[],"targetPullRequestStates":[{"branch":"main","label":"v9.4.0","branchLabelMappingKey":"^v9.4.0$","isSourceBranch":true,"state":"MERGED","url":"https://github.com/elastic/kibana/pull/249168","number":249168,"mergeCommit":{"message":"[ILM] Fix bug when adding to an index template (#249168)\n\n## Summary\n\nElasticsearch's `GET index_template` API returns `created_date_millis`\nand `modified_date_millis` properties, but these properties are not\nallowed in `PUT index_template` requests, causing Elasticsearch to\nreject updates. The fix removes these read-only date properties before\nsending the template back to Elasticsearch in the PUT request.\n\n### How to test\n* Go to ILM plugin\n* Click the tree dots icon in the actions column for some custom policy\n* Click `Add to index template`\n* Select an index template and save\n* The policy should correctly be applied to the index template\n\n### Before this change\n<img width=\"1170\" height=\"1070\" alt=\"Screenshot 2026-01-15 at 11 01 29\"\nsrc=\"https://github.com/user-attachments/assets/45d86252-4466-4d51-bd1a-75a47cd1b481\"\n/>\n\n### After this change\n<img width=\"1296\" height=\"1159\" alt=\"Screenshot 2026-01-15 at 11 42 30\"\nsrc=\"https://github.com/user-attachments/assets/6047c7b6-f4d0-4b19-8f23-29ecbf8fcb7a\"\n/>","sha":"575e9bbd9501018a90a1812ab5cb17dd9658c592"}}]}] BACKPORT--> Co-authored-by: Sonia Sanz Vivas <sonia.sanzvivas@elastic.co>
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# Backport This will backport the following commits from `main` to `9.3`: - [[ILM] Fix bug when adding to an index template (#249168)](#249168) <!--- Backport version: 9.6.6 --> ### Questions ? Please refer to the [Backport tool documentation](https://github.com/sorenlouv/backport) <!--BACKPORT [{"author":{"name":"Sonia Sanz Vivas","email":"sonia.sanzvivas@elastic.co"},"sourceCommit":{"committedDate":"2026-01-21T22:54:40Z","message":"[ILM] Fix bug when adding to an index template (#249168)\n\n## Summary\n\nElasticsearch's `GET index_template` API returns `created_date_millis`\nand `modified_date_millis` properties, but these properties are not\nallowed in `PUT index_template` requests, causing Elasticsearch to\nreject updates. The fix removes these read-only date properties before\nsending the template back to Elasticsearch in the PUT request.\n\n### How to test\n* Go to ILM plugin\n* Click the tree dots icon in the actions column for some custom policy\n* Click `Add to index template`\n* Select an index template and save\n* The policy should correctly be applied to the index template\n\n### Before this change\n<img width=\"1170\" height=\"1070\" alt=\"Screenshot 2026-01-15 at 11 01 29\"\nsrc=\"https://github.com/user-attachments/assets/45d86252-4466-4d51-bd1a-75a47cd1b481\"\n/>\n\n### After this change\n<img width=\"1296\" height=\"1159\" alt=\"Screenshot 2026-01-15 at 11 42 30\"\nsrc=\"https://github.com/user-attachments/assets/6047c7b6-f4d0-4b19-8f23-29ecbf8fcb7a\"\n/>","sha":"575e9bbd9501018a90a1812ab5cb17dd9658c592","branchLabelMapping":{"^v9.4.0$":"main","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["bug","release_note:fix","Feature:ILM","Team:Kibana Management","backport:all-open","v9.4.0"],"title":"[ILM] Fix bug when adding to an index template","number":249168,"url":"https://github.com/elastic/kibana/pull/249168","mergeCommit":{"message":"[ILM] Fix bug when adding to an index template (#249168)\n\n## Summary\n\nElasticsearch's `GET index_template` API returns `created_date_millis`\nand `modified_date_millis` properties, but these properties are not\nallowed in `PUT index_template` requests, causing Elasticsearch to\nreject updates. The fix removes these read-only date properties before\nsending the template back to Elasticsearch in the PUT request.\n\n### How to test\n* Go to ILM plugin\n* Click the tree dots icon in the actions column for some custom policy\n* Click `Add to index template`\n* Select an index template and save\n* The policy should correctly be applied to the index template\n\n### Before this change\n<img width=\"1170\" height=\"1070\" alt=\"Screenshot 2026-01-15 at 11 01 29\"\nsrc=\"https://github.com/user-attachments/assets/45d86252-4466-4d51-bd1a-75a47cd1b481\"\n/>\n\n### After this change\n<img width=\"1296\" height=\"1159\" alt=\"Screenshot 2026-01-15 at 11 42 30\"\nsrc=\"https://github.com/user-attachments/assets/6047c7b6-f4d0-4b19-8f23-29ecbf8fcb7a\"\n/>","sha":"575e9bbd9501018a90a1812ab5cb17dd9658c592"}},"sourceBranch":"main","suggestedTargetBranches":[],"targetPullRequestStates":[{"branch":"main","label":"v9.4.0","branchLabelMappingKey":"^v9.4.0$","isSourceBranch":true,"state":"MERGED","url":"https://github.com/elastic/kibana/pull/249168","number":249168,"mergeCommit":{"message":"[ILM] Fix bug when adding to an index template (#249168)\n\n## Summary\n\nElasticsearch's `GET index_template` API returns `created_date_millis`\nand `modified_date_millis` properties, but these properties are not\nallowed in `PUT index_template` requests, causing Elasticsearch to\nreject updates. The fix removes these read-only date properties before\nsending the template back to Elasticsearch in the PUT request.\n\n### How to test\n* Go to ILM plugin\n* Click the tree dots icon in the actions column for some custom policy\n* Click `Add to index template`\n* Select an index template and save\n* The policy should correctly be applied to the index template\n\n### Before this change\n<img width=\"1170\" height=\"1070\" alt=\"Screenshot 2026-01-15 at 11 01 29\"\nsrc=\"https://github.com/user-attachments/assets/45d86252-4466-4d51-bd1a-75a47cd1b481\"\n/>\n\n### After this change\n<img width=\"1296\" height=\"1159\" alt=\"Screenshot 2026-01-15 at 11 42 30\"\nsrc=\"https://github.com/user-attachments/assets/6047c7b6-f4d0-4b19-8f23-29ecbf8fcb7a\"\n/>","sha":"575e9bbd9501018a90a1812ab5cb17dd9658c592"}}]}] BACKPORT--> Co-authored-by: Sonia Sanz Vivas <sonia.sanzvivas@elastic.co>
kibanamachine
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Jan 22, 2026
# Backport This will backport the following commits from `main` to `9.1`: - [[ILM] Fix bug when adding to an index template (#249168)](#249168) <!--- Backport version: 9.6.6 --> ### Questions ? Please refer to the [Backport tool documentation](https://github.com/sorenlouv/backport) <!--BACKPORT [{"author":{"name":"Sonia Sanz Vivas","email":"sonia.sanzvivas@elastic.co"},"sourceCommit":{"committedDate":"2026-01-21T22:54:40Z","message":"[ILM] Fix bug when adding to an index template (#249168)\n\n## Summary\n\nElasticsearch's `GET index_template` API returns `created_date_millis`\nand `modified_date_millis` properties, but these properties are not\nallowed in `PUT index_template` requests, causing Elasticsearch to\nreject updates. The fix removes these read-only date properties before\nsending the template back to Elasticsearch in the PUT request.\n\n### How to test\n* Go to ILM plugin\n* Click the tree dots icon in the actions column for some custom policy\n* Click `Add to index template`\n* Select an index template and save\n* The policy should correctly be applied to the index template\n\n### Before this change\n<img width=\"1170\" height=\"1070\" alt=\"Screenshot 2026-01-15 at 11 01 29\"\nsrc=\"https://github.com/user-attachments/assets/45d86252-4466-4d51-bd1a-75a47cd1b481\"\n/>\n\n### After this change\n<img width=\"1296\" height=\"1159\" alt=\"Screenshot 2026-01-15 at 11 42 30\"\nsrc=\"https://github.com/user-attachments/assets/6047c7b6-f4d0-4b19-8f23-29ecbf8fcb7a\"\n/>","sha":"575e9bbd9501018a90a1812ab5cb17dd9658c592","branchLabelMapping":{"^v9.4.0$":"main","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["bug","release_note:fix","Feature:ILM","Team:Kibana Management","backport:all-open","v9.4.0"],"title":"[ILM] Fix bug when adding to an index template","number":249168,"url":"https://github.com/elastic/kibana/pull/249168","mergeCommit":{"message":"[ILM] Fix bug when adding to an index template (#249168)\n\n## Summary\n\nElasticsearch's `GET index_template` API returns `created_date_millis`\nand `modified_date_millis` properties, but these properties are not\nallowed in `PUT index_template` requests, causing Elasticsearch to\nreject updates. The fix removes these read-only date properties before\nsending the template back to Elasticsearch in the PUT request.\n\n### How to test\n* Go to ILM plugin\n* Click the tree dots icon in the actions column for some custom policy\n* Click `Add to index template`\n* Select an index template and save\n* The policy should correctly be applied to the index template\n\n### Before this change\n<img width=\"1170\" height=\"1070\" alt=\"Screenshot 2026-01-15 at 11 01 29\"\nsrc=\"https://github.com/user-attachments/assets/45d86252-4466-4d51-bd1a-75a47cd1b481\"\n/>\n\n### After this change\n<img width=\"1296\" height=\"1159\" alt=\"Screenshot 2026-01-15 at 11 42 30\"\nsrc=\"https://github.com/user-attachments/assets/6047c7b6-f4d0-4b19-8f23-29ecbf8fcb7a\"\n/>","sha":"575e9bbd9501018a90a1812ab5cb17dd9658c592"}},"sourceBranch":"main","suggestedTargetBranches":[],"targetPullRequestStates":[{"branch":"main","label":"v9.4.0","branchLabelMappingKey":"^v9.4.0$","isSourceBranch":true,"state":"MERGED","url":"https://github.com/elastic/kibana/pull/249168","number":249168,"mergeCommit":{"message":"[ILM] Fix bug when adding to an index template (#249168)\n\n## Summary\n\nElasticsearch's `GET index_template` API returns `created_date_millis`\nand `modified_date_millis` properties, but these properties are not\nallowed in `PUT index_template` requests, causing Elasticsearch to\nreject updates. The fix removes these read-only date properties before\nsending the template back to Elasticsearch in the PUT request.\n\n### How to test\n* Go to ILM plugin\n* Click the tree dots icon in the actions column for some custom policy\n* Click `Add to index template`\n* Select an index template and save\n* The policy should correctly be applied to the index template\n\n### Before this change\n<img width=\"1170\" height=\"1070\" alt=\"Screenshot 2026-01-15 at 11 01 29\"\nsrc=\"https://github.com/user-attachments/assets/45d86252-4466-4d51-bd1a-75a47cd1b481\"\n/>\n\n### After this change\n<img width=\"1296\" height=\"1159\" alt=\"Screenshot 2026-01-15 at 11 42 30\"\nsrc=\"https://github.com/user-attachments/assets/6047c7b6-f4d0-4b19-8f23-29ecbf8fcb7a\"\n/>","sha":"575e9bbd9501018a90a1812ab5cb17dd9658c592"}}]}] BACKPORT--> Co-authored-by: Sonia Sanz Vivas <sonia.sanzvivas@elastic.co>
kibanamachine
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Jan 22, 2026
# Backport This will backport the following commits from `main` to `9.2`: - [[ILM] Fix bug when adding to an index template (#249168)](#249168) <!--- Backport version: 9.6.6 --> ### Questions ? Please refer to the [Backport tool documentation](https://github.com/sorenlouv/backport) <!--BACKPORT [{"author":{"name":"Sonia Sanz Vivas","email":"sonia.sanzvivas@elastic.co"},"sourceCommit":{"committedDate":"2026-01-21T22:54:40Z","message":"[ILM] Fix bug when adding to an index template (#249168)\n\n## Summary\n\nElasticsearch's `GET index_template` API returns `created_date_millis`\nand `modified_date_millis` properties, but these properties are not\nallowed in `PUT index_template` requests, causing Elasticsearch to\nreject updates. The fix removes these read-only date properties before\nsending the template back to Elasticsearch in the PUT request.\n\n### How to test\n* Go to ILM plugin\n* Click the tree dots icon in the actions column for some custom policy\n* Click `Add to index template`\n* Select an index template and save\n* The policy should correctly be applied to the index template\n\n### Before this change\n<img width=\"1170\" height=\"1070\" alt=\"Screenshot 2026-01-15 at 11 01 29\"\nsrc=\"https://github.com/user-attachments/assets/45d86252-4466-4d51-bd1a-75a47cd1b481\"\n/>\n\n### After this change\n<img width=\"1296\" height=\"1159\" alt=\"Screenshot 2026-01-15 at 11 42 30\"\nsrc=\"https://github.com/user-attachments/assets/6047c7b6-f4d0-4b19-8f23-29ecbf8fcb7a\"\n/>","sha":"575e9bbd9501018a90a1812ab5cb17dd9658c592","branchLabelMapping":{"^v9.4.0$":"main","^v(\\d+).(\\d+).\\d+$":"$1.$2"}},"sourcePullRequest":{"labels":["bug","release_note:fix","Feature:ILM","Team:Kibana Management","backport:all-open","v9.4.0"],"title":"[ILM] Fix bug when adding to an index template","number":249168,"url":"https://github.com/elastic/kibana/pull/249168","mergeCommit":{"message":"[ILM] Fix bug when adding to an index template (#249168)\n\n## Summary\n\nElasticsearch's `GET index_template` API returns `created_date_millis`\nand `modified_date_millis` properties, but these properties are not\nallowed in `PUT index_template` requests, causing Elasticsearch to\nreject updates. The fix removes these read-only date properties before\nsending the template back to Elasticsearch in the PUT request.\n\n### How to test\n* Go to ILM plugin\n* Click the tree dots icon in the actions column for some custom policy\n* Click `Add to index template`\n* Select an index template and save\n* The policy should correctly be applied to the index template\n\n### Before this change\n<img width=\"1170\" height=\"1070\" alt=\"Screenshot 2026-01-15 at 11 01 29\"\nsrc=\"https://github.com/user-attachments/assets/45d86252-4466-4d51-bd1a-75a47cd1b481\"\n/>\n\n### After this change\n<img width=\"1296\" height=\"1159\" alt=\"Screenshot 2026-01-15 at 11 42 30\"\nsrc=\"https://github.com/user-attachments/assets/6047c7b6-f4d0-4b19-8f23-29ecbf8fcb7a\"\n/>","sha":"575e9bbd9501018a90a1812ab5cb17dd9658c592"}},"sourceBranch":"main","suggestedTargetBranches":[],"targetPullRequestStates":[{"branch":"main","label":"v9.4.0","branchLabelMappingKey":"^v9.4.0$","isSourceBranch":true,"state":"MERGED","url":"https://github.com/elastic/kibana/pull/249168","number":249168,"mergeCommit":{"message":"[ILM] Fix bug when adding to an index template (#249168)\n\n## Summary\n\nElasticsearch's `GET index_template` API returns `created_date_millis`\nand `modified_date_millis` properties, but these properties are not\nallowed in `PUT index_template` requests, causing Elasticsearch to\nreject updates. The fix removes these read-only date properties before\nsending the template back to Elasticsearch in the PUT request.\n\n### How to test\n* Go to ILM plugin\n* Click the tree dots icon in the actions column for some custom policy\n* Click `Add to index template`\n* Select an index template and save\n* The policy should correctly be applied to the index template\n\n### Before this change\n<img width=\"1170\" height=\"1070\" alt=\"Screenshot 2026-01-15 at 11 01 29\"\nsrc=\"https://github.com/user-attachments/assets/45d86252-4466-4d51-bd1a-75a47cd1b481\"\n/>\n\n### After this change\n<img width=\"1296\" height=\"1159\" alt=\"Screenshot 2026-01-15 at 11 42 30\"\nsrc=\"https://github.com/user-attachments/assets/6047c7b6-f4d0-4b19-8f23-29ecbf8fcb7a\"\n/>","sha":"575e9bbd9501018a90a1812ab5cb17dd9658c592"}}]}] BACKPORT--> Co-authored-by: Sonia Sanz Vivas <sonia.sanzvivas@elastic.co>
yuliia-fryshko
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Jan 22, 2026
## Summary Elasticsearch's `GET index_template` API returns `created_date_millis` and `modified_date_millis` properties, but these properties are not allowed in `PUT index_template` requests, causing Elasticsearch to reject updates. The fix removes these read-only date properties before sending the template back to Elasticsearch in the PUT request. ### How to test * Go to ILM plugin * Click the tree dots icon in the actions column for some custom policy * Click `Add to index template` * Select an index template and save * The policy should correctly be applied to the index template ### Before this change <img width="1170" height="1070" alt="Screenshot 2026-01-15 at 11 01 29" src="https://github.com/user-attachments/assets/45d86252-4466-4d51-bd1a-75a47cd1b481" /> ### After this change <img width="1296" height="1159" alt="Screenshot 2026-01-15 at 11 42 30" src="https://github.com/user-attachments/assets/6047c7b6-f4d0-4b19-8f23-29ecbf8fcb7a" />
qn895
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Jan 22, 2026
## Summary Elasticsearch's `GET index_template` API returns `created_date_millis` and `modified_date_millis` properties, but these properties are not allowed in `PUT index_template` requests, causing Elasticsearch to reject updates. The fix removes these read-only date properties before sending the template back to Elasticsearch in the PUT request. ### How to test * Go to ILM plugin * Click the tree dots icon in the actions column for some custom policy * Click `Add to index template` * Select an index template and save * The policy should correctly be applied to the index template ### Before this change <img width="1170" height="1070" alt="Screenshot 2026-01-15 at 11 01 29" src="https://github.com/user-attachments/assets/45d86252-4466-4d51-bd1a-75a47cd1b481" /> ### After this change <img width="1296" height="1159" alt="Screenshot 2026-01-15 at 11 42 30" src="https://github.com/user-attachments/assets/6047c7b6-f4d0-4b19-8f23-29ecbf8fcb7a" />
dennis-tismenko
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Jan 22, 2026
## Summary Elasticsearch's `GET index_template` API returns `created_date_millis` and `modified_date_millis` properties, but these properties are not allowed in `PUT index_template` requests, causing Elasticsearch to reject updates. The fix removes these read-only date properties before sending the template back to Elasticsearch in the PUT request. ### How to test * Go to ILM plugin * Click the tree dots icon in the actions column for some custom policy * Click `Add to index template` * Select an index template and save * The policy should correctly be applied to the index template ### Before this change <img width="1170" height="1070" alt="Screenshot 2026-01-15 at 11 01 29" src="https://github.com/user-attachments/assets/45d86252-4466-4d51-bd1a-75a47cd1b481" /> ### After this change <img width="1296" height="1159" alt="Screenshot 2026-01-15 at 11 42 30" src="https://github.com/user-attachments/assets/6047c7b6-f4d0-4b19-8f23-29ecbf8fcb7a" />
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Summary
Elasticsearch's
GET index_templateAPI returnscreated_date_millisandmodified_date_millisproperties, but these properties are not allowed inPUT index_templaterequests, causing Elasticsearch to reject updates. The fix removes these read-only date properties before sending the template back to Elasticsearch in the PUT request.How to test
Add to index templateBefore this change
After this change