added failing test

Author: chrisparrinello

server/src/test/java/org/elasticsearch/rest/action/search/SearchPhaseCoordinatorAPMMetricsTests.java

@@ -41,6 +41,7 @@ public class SearchPhaseCoordinatorAPMMetricsTests extends ESSingleNodeTestCase
     private static final String indexName = "test_coordinator_search_phase_metrics";
     private final int num_primaries = randomIntBetween(2, 7);
 
+    private static final String CAN_MATCH_SEARCH_PHASE_METRIC = "es.search_response.took_durations.can_match.histogram";
     private static final String DFS_QUERY_SEARCH_PHASE_METRIC = "es.search_response.took_durations.dfs_query.histogram";
     private static final String DFS_SEARCH_PHASE_METRIC = "es.search_response.took_durations.dfs.histogram";
     private static final String FETCH_SEARCH_PHASE_METRIC = "es.search_response.took_durations.fetch.histogram";
@@ -112,6 +113,20 @@ public void testPointInTime() {
         }
     }
 
+    public void testCanMatchSearch() {
+        assertSearchHitsWithoutFailures(
+            client().prepareSearch(indexName)
+                .setSearchType(SearchType.QUERY_THEN_FETCH)
+                .setPreFilterShardSize(1)
+                .setQuery(simpleQueryStringQuery("doc1")),
+            "1"
+        );
+
+        assertMeasurements(
+            List.of(CAN_MATCH_SEARCH_PHASE_METRIC, FETCH_SEARCH_PHASE_METRIC, QUERY_SEARCH_PHASE_METRIC)
+        );
+
+    }
     private void resetMeter() {
         getTestTelemetryPlugin().resetMeter();
     }