Only query for watcher history docs with the expected state,

otherwise other history docs can be returned, which may not
have the expected state, and this test only checks the first hit.

Relates to #30777

x-pack/qa/smoke-test-watcher-with-security/src/test/java/org/elasticsearch/smoketest/SmokeTestWatcherWithSecurityIT.java

@@ -181,9 +181,7 @@ public class SmokeTestWatcherWithSecurityIT extends ESRestTestCase {
         }
 
         // check history, after watch has fired
-        ObjectPath objectPath = getWatchHistoryEntry(watchId);
-        String state = objectPath.evaluate("hits.hits.0._source.state");
-        assertThat(state, is("execution_not_needed"));
+        ObjectPath objectPath = getWatchHistoryEntry(watchId, "execution_not_needed");
         boolean conditionMet = objectPath.evaluate("hits.hits.0._source.result.condition.met");
         assertThat(conditionMet, is(false));
     }