OpenSearch fork changes

[sruti1312]

Fixes #:

Description of changes:
OpenSearch fork changes

Tests:
./gradlew build locally

If new tests are added, how long do the new ones take to complete

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[kkhatua]

LGTM +1

[craph]

It looks like this PR breaks the ShardBulkDocs metrics... Now it's always displaying weird / wrong values 😢