_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
tileBuilder.build().writeTo(bytesOut);
                    return new RestResponse(RestStatus.OK, MIME_TYPE, bytesOut.bytes());
                }
            }
        });
    }
    private static SearchRequestBuilder searchRequestBuilder(RestCancellableNodeClient client, VectorTileRequest request)
        throws IOException {
        final SearchRequestBuilder searchRequestBuilder = client.prepareSearch(request.getIndexes());
        searchRequestBuilder.setSize(request.getSize());
        searchRequestBuilder.setFetchSource(false);
        searchRequestBuilder.setTrackTotalHitsUpTo(request.getTrackTotalHitsUpTo());
        for (FieldAndFormat field : request.getFieldAndFormats()) {
            searchRequestBuilder.addFetchField(field);
        }
        
        String args = request.getZ() + "/" + request.getX() + "/" + request.getY() + "@" + request.getExtent() + ":" + request.getBuffer();
        searchRequestBuilder.addFetchField(new FieldAndFormat(request.getField(), "mvt(" + args + ")"));
        Map<String, Object> runtimeMappings = request.getRuntimeMappings();
        if (request.getWithLabels()) {
            
            Map<String, Object> mappings = new HashMap<>();
            if (runtimeMappings.size() > 0) {
                mappings.putAll(runtimeMappings);
            }
            HashMap<String, Object> labelsMap = new HashMap<>();
            labelsMap.put("type", "geo_point");
            labelsMap.put(
                "script",
                "GeoPoint point = doc['" + request.getField() + "'].getLabelPosition(); emit(point.getLat(), point.getLon());"