Update gRPC terms lookup for protobufs 1.7.0 (id_2/query)

[wanshi-ma]

Description

Updates the gRPC Search API reference for the protobufs 1.7.0 changes to TermsLookup. 1.7.0 adds an id_2 / query oneof to TermsLookup and deprecates the flat id field, and renames the TermsQuery map/value fields (terms_lookup_field_string_array_map → terms, terms_lookup_field → lookup, string_array → value). This PR:

• Adds TermsQueryField and TermsLookup message-field tables, documenting id_2, query, routing, store, and marking id as deprecated (use id_2).
• Updates the "Terms query" and "Terms query with a terms lookup" examples to the 1.7.0 field names, and adds examples for the new id_2 (document-id) and query (query-based) lookups plus the deprecated-id backward-compatibility path.

All request examples were verified against a local node running the 1.7.0 protobufs (server code change: opensearch-project/OpenSearch#22759).

Issues Resolved

Companion to opensearch-project/OpenSearch#22759 (protobufs 1.7.0 bump); protobufs schema change: opensearch-project/opensearch-protobufs#480.

Version

3.9

Frontend features

N/A

Checklist

• By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license and subject to the Developers Certificate of Origin.

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[kolchfa-aws]

Thank you, @wanshi-ma!

[kolchfa-aws]

Thank you, @wanshi-ma! @karenyrx Would you like to review this PR?

[karenyrx]

Thanks @wanshi-ma ! This PR looks good to me, provided opensearch-project/OpenSearch#22759 is merged (which should be soon).

For upgrading the rest of the file from protobufs version 1.4.0 -> 1.7.0, I'll take it up as a separate PR: https://github.com/opensearch-project/documentation-website/pull/12980/changes