Enable Partial Flat Object (#7997)

Before this PR, flat_object can only be defined at the root field of JSON object in 2.7 and 2.8, because the json object is flatten so it lost the structure of a tree. Now, this PR enables json object to be partially mapped as flat_object field type while other fields in the JSON can be other field type. --------- Signed-off-by: Mingshi Liu <mingshl@amazon.com> (cherry picked from commit d333cd3) Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>
opensearch-project · Jul 7, 2023 · 281e2b4 · 281e2b4
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diff --git a/CHANGELOG.md b/CHANGELOG.md
@@ -25,6 +25,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 - [Extensions] Support extension additional settings with extension REST initialization ([#8414](https://github.com/opensearch-project/OpenSearch/pull/8414))
 - Adds mock implementation for TelemetryPlugin ([#7545](https://github.com/opensearch-project/OpenSearch/issues/7545))
 - Create concept of persistent ThreadContext headers that are unstashable ([#8291]()https://github.com/opensearch-project/OpenSearch/pull/8291)
+- Enable Partial Flat Object ([#7997](https://github.com/opensearch-project/OpenSearch/pull/7997))
 
 ### Dependencies
 - Bump `com.azure:azure-storage-common` from 12.21.0 to 12.21.1 (#7566, #7814)