[BUG] FieldSort not implement SortOptionsVariant

[jbrun]

What is the bug?

When we want to sort a request, FieldSort doesn’t implement SortOptionVariant, so we cannot use it in SearchRequest with SortOptionsBuilders

How can one reproduce the bug?

SearchRequest.Builder searchRequest = new SearchRequest.Builder() .sort(SortOptionsBuilders.field().field(“lastName”).order(SortOrder.Desc).build()._toSortOptions());

or

SearchRequest.Builder searchRequest = new SearchRequest.Builder() .sort(FieldSort.of(s → s.field(“lastName”).order(ortOrder.Desc))._toSortOptions());

._toSortOptions() not available

However ScoreSort, GeoDistanceSort and ScriptSort implement SortOptionVariant

What is the expected behavior?

package org.opensearch.client.opensearch._types;
public class FieldSort implements SortOptionsVariant, JsonpSerializable

What is your host/environment?

opensearch-java:2.10.4

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