_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/qa/multi-cluster/src/javaRestTest/java/org/elasticsearch/vectortile/VectorTileCCSIT.java
if (layerName.equals(layer.getName())) {
                return layer;
            }
        }
        fail("Could not find layer " + layerName);
        return null;
    }
    private VectorTile.Tile execute(RestClient client, Request mvtRequest) throws IOException {
        final Response response = client.performRequest(mvtRequest);
        final InputStream inputStream = response.getEntity().getContent();
        assertThat(response.getStatusLine().getStatusCode(), Matchers.equalTo(HttpStatus.SC_OK));
        return VectorTile.Tile.parseFrom(inputStream);
    }
    private RestClient buildLocalClusterClient() throws IOException {
        return buildClient(System.getProperty("tests.local"));
    }
    private RestClient buildRemoteClusterClient() throws IOException {
        return buildClient(System.getProperty("tests.remote"));
    }
    private RestClient buildClient(final String url) throws IOException {
        final int portSeparator = url.lastIndexOf(':');
        final HttpHost httpHost = new HttpHost(
            url.substring(0, portSeparator),
            Integer.parseInt(url.substring(portSeparator + 1)),
            getProtocol()
        );
        return buildClient(restAdminSettings(), new HttpHost[] { httpHost });
    }
}