inline assertion

Author: luigidellaquila

x-pack/plugin/esql/src/internalClusterTest/java/org/elasticsearch/xpack/esql/action/CrossClusterLookupJoinIT.java

@@ -288,17 +288,14 @@ public void testLookupJoinMissingLocalIndexAfterPipelineBreaker() throws IOExcep
         setupClusters(2);
         populateLookupIndex(REMOTE_CLUSTER_1, "values_lookup", 10);
 
-        var ex = expectThrows(
+        expectThrows(
             VerificationException.class,
+            containsString("LOOKUP JOIN with remote indices can't be executed after [STATS lookup_key = max(lookup_key)]"),
             () -> runQuery(
                 "FROM c*:logs-* | EVAL lookup_key = v | STATS lookup_key = max(lookup_key) | LOOKUP JOIN values_lookup ON lookup_key",
                 randomBoolean()
             )
         );
-        assertThat(
-            ex.getMessage(),
-            containsString("LOOKUP JOIN with remote indices can't be executed after [STATS lookup_key = max(lookup_key)]")
-        );
     }
 
     public void testLookupJoinMissingKey() throws IOException {