### 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
}
            } catch (IOException e) {
                throw new SearchException(shardTarget, "failed to create sort elements", e);
            }
        }
        context.trackScores(source.trackScores());
        if (source.trackTotalHitsUpTo() != null
            && source.trackTotalHitsUpTo() != SearchContext.TRACK_TOTAL_HITS_ACCURATE
            && context.scrollContext() != null) {
            throw new SearchException(shardTarget, "disabling [track_total_hits] is not allowed in a scroll context");
        }
        if (source.trackTotalHitsUpTo() != null) {
            context.trackTotalHitsUpTo(source.trackTotalHitsUpTo());
        }
        if (source.minScore() != null) {
            context.minimumScore(source.minScore());
        }
        if (source.profile()) {
            context.setProfilers(new Profilers(context.searcher()));
        }
        if (source.timeout() != null) {
            context.timeout(source.timeout());
        }
        context.terminateAfter(source.terminateAfter());
        if (source.aggregations() != null && includeAggregations) {
            AggregationContext aggContext = new ProductionAggregationContext(
                indicesService.getAnalysis(),
                context.getSearchExecutionContext(),
                bigArrays,
                source.aggregations().bytesToPreallocate(),