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ba62ff89 - BUGFIX: Support for elastic indices that don't return 'metadata' in '_source' (#13903)

BUGFIX: Support for elastic indices that don't return 'metadata' in '_source' (#13903) Description: Some Elastic indexes do not return a 'metadata' field in '_source'. However, prior to this PR, the code assumed there always is a 'metadata' field. This PR adds support for cases where the field is missing by adding it manually. Issue: #13869