[8.18] Make flattened synthetic source concatenate object keys on scalar/object mismatch (#129600)#129794
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elasticsearchmachine merged 3 commits intoelastic:8.18from Jun 20, 2025
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…ect mismatch (elastic#129600) There is an issue where for Flattened fields with synthetic source, if there is a key with a scalar value, and a duplicate key with an object value, one of the values will be left out of the produced synthetic source. This fixes the issue by replacing the object with paths to each of its keys. These paths consist of the concatenation of all keys going down to a given scalar, joined by a period. For example, they are of the form foo.bar.baz. This applies recursively, so that every value within the object, no matter how nested, will be accessible through a full specified path. (cherry picked from commit 245dc07)
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