_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
request.getZ(),
                        request.getX(),
                        request.getY(),
                        request.getExtent(),
                        request.getBuffer()
                    );
                    
                    final VectorTile.Tile.Builder tileBuilder = VectorTile.Tile.newBuilder();
                    ensureOpen();
                    final SearchHit[] hits = searchResponse.getHits().getHits();
                    if (hits.length > 0) {
                        tileBuilder.addLayers(buildHitsLayer(hits, request, featureFactory));
                    }
                    ensureOpen();
                    final InternalGeoGrid<?> grid = searchResponse.getAggregations() != null
                        ? searchResponse.getAggregations().get(GRID_FIELD)
                        : null;
                    
                    if (grid != null && grid.getBuckets().size() > 0) {
                        tileBuilder.addLayers(buildAggsLayer(grid, request, featureFactory));
                    }
                    ensureOpen();
                    final InternalGeoBounds bounds = searchResponse.getAggregations() != null
                        ? searchResponse.getAggregations().get(BOUNDS_FIELD)
                        : null;
                    final Aggregations aggsWithoutGridAndBounds = searchResponse.getAggregations() == null
                        ? null
                        : new Aggregations(
                            searchResponse.getAggregations()
                                .asList()