[BUG] Missing Neural Sparse Support in Java Client (Query.java and Processor.java)

[szigetiatti]

What is the bug?

The OpenSearch Java client is missing support for neural_sparse queries in Query.java and for the sparse_encoding processor in Processor.java.

What is the expected behavior?

The Java client should expose builders for:

neural_sparse queries via Query.java

sparse_encoding processors via Processor.java

Do you have any additional context?

The missing support forces developers to manually craft JSON requests or use REST calls directly, which defeats the purpose of having a strongly typed Java client.

[Xtansia]

The specifications for these needs to be added to https://github.com/opensearch-project/opensearch-api-specification first, and then they will be automatically code generated in the client.

[GAAZ]

I need too