_mvt endpoint does not include cross cluster prefix with `_index` value. For example, `_index` returns `myIndexPattern` instead of expected `cluster_one:myIndexPattern`. _search endpoint includes cross cluster prefix with `_index` value. This is causing problems in [Kibana maps tooltips](https://github.com/elastic/kibana/issues/153210)
x-pack/plugin/vector-tile/src/main/java/org/elasticsearch/xpack/vectortile/rest/RestVectorTileAction.java
import org.elasticsearch.rest.action.RestResponseListener;
import org.elasticsearch.search.SearchHit;
import org.elasticsearch.search.SearchHits;
import org.elasticsearch.search.aggregations.Aggregation;
import org.elasticsearch.search.aggregations.Aggregations;
import org.elasticsearch.search.aggregations.MultiBucketConsumerService;
import org.elasticsearch.search.aggregations.bucket.geogrid.GeoGridAggregationBuilder;
import org.elasticsearch.search.aggregations.bucket.geogrid.InternalGeoGrid;
import org.elasticsearch.search.aggregations.bucket.geogrid.InternalGeoGridBucket;
import org.elasticsearch.search.aggregations.metrics.GeoBoundsAggregationBuilder;
import org.elasticsearch.search.aggregations.metrics.GeoCentroidAggregationBuilder;
import org.elasticsearch.search.aggregations.metrics.InternalGeoBounds;
import org.elasticsearch.search.aggregations.pipeline.StatsBucketPipelineAggregationBuilder;
import org.elasticsearch.search.aggregations.support.ValuesSourceAggregationBuilder.MetricsAggregationBuilder;
import org.elasticsearch.search.fetch.subphase.FieldAndFormat;
import org.elasticsearch.search.profile.SearchProfileResults;
import org.elasticsearch.search.sort.SortBuilder;
import org.elasticsearch.xpack.vectortile.feature.FeatureFactory;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.stream.Collectors;
import static org.elasticsearch.rest.RestRequest.Method.GET;
import static org.elasticsearch.rest.RestRequest.Method.POST;
/**
 * Main class handling a call to the _mvt API.
 */
public class RestVectorTileAction extends BaseRestHandler {