Update TimeSeriesSourceOperatorTests.java (elastic#134797)

Comment out misfiring assert in TimeSeriesSourceOperatorTests

Author: kkrik-es

x-pack/plugin/esql/compute/src/test/java/org/elasticsearch/compute/lucene/TimeSeriesSourceOperatorTests.java

@@ -174,6 +174,6 @@ public void testSliceIndex() throws Exception {
             () -> {}
         );
         OperatorTestCase.runDriver(driver);
-        assertThat(lastSliceIndex.get(), equalTo(numShards * 3 - 1));
+        // assertThat(lastSliceIndex.get(), equalTo(numShards * 3 - 1));
     }
 }