[DOC] Deprecate batch_size in bulk and move it to two processors

[chishui]

What do you want to do?

• Request a change to existing documentation
• Add new documentation
• Report a technical problem with the documentation
• Other

Tell us about your request. Provide a summary of the request.

1. Deprecate parameter "batch_size" of _bulk API
2. Add "batch_size" in two processors: text_embedding and sparse_encoding

*Version: List the OpenSearch version to which this issue applies, e.g. 2.14, 2.12--2.14, or all.
2.16

What other resources are available? Provide links to related issues, POCs, steps for testing, etc.
opensearch-project/OpenSearch#14283