### Description

In [siren federate](https://siren.io/federate/) we extend the `SearchService` to create `SearchContext` instances. In 8.8 this is not possible anymore because the `createContext` method takes the `ResultsType` enum which is package private.

https://github.com/elastic/elasticsearch/blob/b640c217cccab67dce7d954bc92b6b519c102b16/server/src/main/java/org/elasticsearch/search/SearchService.java#L992-L998

In order to be able to keep on calling that method from another package, the visibility of the enum `ResultsType` should be increased to `protected`.
server/src/main/java/org/elasticsearch/search/SearchService.java
shardTarget,
                threadPool::relativeTimeInMillis,
                timeout,
                fetchPhase,
                lowLevelCancellation
            );
            
            
            
            SearchExecutionContext context = new SearchExecutionContext(searchContext.getSearchExecutionContext());
            Rewriteable.rewrite(request.getRewriteable(), context, true);
            assert searchContext.getSearchExecutionContext().isCacheable();
            success = true;
        } finally {
            if (success == false) {
                
                
                
                IOUtils.closeWhileHandlingException(searchContext);
            }
        }
        return searchContext;
    }
    private void freeAllContextForIndex(Index index) {
        assert index != null;
        for (ReaderContext ctx : activeReaders.values()) {
            if (index.equals(ctx.indexShard().shardId().getIndex())) {
                freeReaderContext(ctx.id());
            }
        }