[8.19] Bug fix: the filter of a data stream alias is not always properly removed. (#139679)#139691
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elasticsearchmachine merged 1 commit intoelastic:8.19from Dec 17, 2025
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…oved. (elastic#139679) A data stream alias that has more than 1 data stream does not handle correctly the removal of a filtered data stream alias. It currently retains the filter even after the alias is removed. ``` # Create 2 data streams PUT _data_stream/logs-yyy-default PUT _data_stream/logs-xxx-default # Add a filtered alias to one and a simple alias to the other. POST _aliases { "actions": [ { "add": { "index": "logs-yyy-default", "alias": "myalias", "filter": { "term": { "type": "mytype" } } } }, { "add": { "index": "logs-xxx-default", "alias": "myalias" } } ] } # Remove the filtered alias POST _aliases { "actions": [ { "remove": { "index": "logs-yyy-default", "alias": "myalias" } } ] } # Add back the alias but WITHOUT filter POST _aliases { "actions": [ { "add": { "index": "logs-yyy-default", "alias": "myalias" } } ] } ``` The last alias will contain the initial filter while it should not. This PR fixes that. Furthermore, we edit the update and removal of data streams from an alias to be able to handle orphaned aliases.
gmarouli
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:StorageEngine/Data streams
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Backports the following commits to 8.19: