[BUG] MultisearchBody or RequestItem missing sort property in msearch

[mpr20001]

What is the bug?

SearchRequest offers the possibility to set the 'sort' property, but this is missing in MultisearchBody or RequestItem.

How can one reproduce the bug?

GET index-name/_msearch
{}
{"sort":[{"search.count":{"order":"desc"}}],"from":0,"timeout":"60s","size":5,"query":{"bool":{"filter":{"percolate":{"field":"search.query","document":{"keyword":"This is a test sentence"}}}}}}
{"index": "index-name"}
{"sort":[{"search.count":{"order":"desc"}}],"from":0,"timeout":"60s","size":5,"query":{"bool":{"filter":{"percolate":{"field":"search.query","document":{"keyword":"This is test sentence 2"}}}}}}

Opensearch allows "sort" in the REST request but not with opensearch java client

        multiSearchBodyBuilder.sort(new SortOptions.Builder()
          .field(new FieldSort.Builder()
            .field(documentSearchRequest.sortFieldName)
            .order(documentSearchRequest.effectiveSortOrder)
            .build())
          .build())

throws

java.lang.NoSuchMethodError: 'org.opensearch.client.opensearch.core.msearch.MultisearchBody$Builder org.opensearch.client.opensearch.core.msearch.MultisearchBody$Builder.sort(org.opensearch.client.opensearch._types.SortOptions, org.opensearch.client.opensearch._types.SortOptions[])'

What is the expected behavior?

MultiSearchBody should allow sort functionality.

What is your host/environment?

opensearch java 2.6 .

Do you have any screenshots?

N/A

Do you have any additional context?

It looks like elasticsearch-java fixed this bug in 7.17.5 elastic/elasticsearch-java#170

[dblock]

Want to try to implement this?

[VachaShah]

@mpr20001 The sort functionality was added in #516 and #519 (for 2.x) in version 2.6.0. An example of how to use the sort function is https://github.com/opensearch-project/opensearch-java/blob/main/java-client/src/test/java/org/opensearch/client/opensearch/integTest/AbstractMultiSearchRequestIT.java#L224. Can you please confirm if this still does not work for you?

[VachaShah]

The requested functionality is added in the client. Please reopen this issue if you are still facing any errors. Thank you!