fixup

Author: pabloem

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

@@ -324,7 +324,7 @@ public void testRateWithTimeBucketAndClusterMultipleStatsByMin() {
             | SORT tbucket, cluster
             | LIMIT 5
             | EVAL avg_rate= s/c
-            | KEEP avg_rate, `max(rate(request_count))`, `avg(rate(request_count))`, ts, cluster
+            | KEEP avg_rate, `max(rate(request_count))`, `avg(rate(request_count))`, tbucket, cluster
             """)) {
             try {
                 assertThat(