Cannot add metadata "version" to OpenSearchDocumentStore

[tstadel]

Describe the bug
When adding documents with metadata field "version" to OpenSearchDocumentStore we get HTTP 400.

Error message

'Exception while running node 'DocumentStore': RequestError(400, 'action_request_validation_exception', 'Validation Failed: 1: internal versioning can not be used for optimistic concurrency control. Please use `if_seq_no` and `if_primary_term` instead;2: internal versioning can not be used for optimistic concurrency control. Please use `if_seq_no` and `if_primary_term` instead;3: internal versioning can not be used for optimistic concurrency control. Please use `if_seq_no` and `if_primary_term` instead;4: internal versioning can not be used for optimistic concurrency control. Please use `if_seq_no` and `if_primary_term` instead;5: internal versioning can not be used for optimistic concurrency control. Please use `if_seq_no` and `if_primary_term` instead;6: internal versioning can not be used for optimistic concurre
...

Expected behavior
We can add metadata field "version".

Additional context
Looking into the the client code, ElasticSearchDocumentStore has the same issue.

To Reproduce
Create document with meta field "version" and run OpenSearchDocumentStore.write_documents().

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System:

• OS:
• GPU/CPU:
• Haystack version (commit or version number): 1.17.1
• DocumentStore: OpenSearchDocumentStore
• Reader:
• Retriever: