OpenSearch: Omit explicit document IDs when manageDocumentIds=false for AWS Serverless (issue - #3818)#4220

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lsh1215 wants to merge 2 commits intospring-projects:mainfrom

lsh1215:fix/opensearch-serverless-document-id-issue

Commits on Aug 22, 2025

OpenSearch: omit explicit IDs when manageDocumentIds=false; add unit/ITs; AWS Serverless compat.
lsh1215
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Commits on Oct 19, 2025

Set manageDocumentIds default to true for backward compatibility
lsh1215
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