Verify no leftover heartbeats after any singleRebuild

Author: jjezra

fdb-record-layer-core/src/test/java/com/apple/foundationdb/record/provider/foundationdb/OnlineIndexerBuildIndexTest.java

@@ -22,6 +22,7 @@
 
 import com.apple.foundationdb.async.AsyncUtil;
 import com.apple.foundationdb.async.RangeSet;
+import com.apple.foundationdb.record.IndexBuildProto;
 import com.apple.foundationdb.record.IndexState;
 import com.apple.foundationdb.record.logging.KeyValueLogMessage;
 import com.apple.foundationdb.record.logging.LogMessageKeys;
@@ -45,6 +46,7 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
+import java.util.UUID;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.CompletionException;
 import java.util.concurrent.ThreadLocalRandom;
@@ -304,6 +306,10 @@ <M extends Message> void singleRebuild(
                         ));
             }
         }
+        try (OnlineIndexer indexBuilder = newIndexerBuilder(index).build()) {
+            final Map<UUID, IndexBuildProto.IndexBuildHeartbeat> heartbeats = indexBuilder.getIndexingHeartbeats(0);
+            assertTrue(heartbeats.isEmpty());
+        }
         KeyValueLogMessage msg = KeyValueLogMessage.build("building index - completed", TestLogMessageKeys.INDEX, index);
         msg.addKeysAndValues(timer.getKeysAndValues());
         LOGGER.info(msg.toString());