Fix missing import in AbstractWatcherIntegrationTestCase
Original commit: elastic/x-pack-elasticsearch@8bfa505333161bd1bacd5ab19d9ebb2029d78edd
@@ -70,6 +70,7 @@ import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Locale;
+import java.util.Map;
import java.util.Set;
import java.util.concurrent.atomic.AtomicReference;
import java.util.function.Consumer;
