[ElasticsearchStore] Enable custom Bulk Args (#11065)
This enables bulk args like `chunk_size` to be passed down from the
ingest methods (from_text, from_documents) to be passed down to the bulk
API.
This helps alleviate issues where bulk importing a large amount of
documents into Elasticsearch was resulting in a timeout.
Contribution Shoutout
- @elastic
- [x] Updated Integration tests
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Co-authored-by: Bagatur <baskaryan@gmail.com>
