fix unreleased state

Author: idegtiarenko

x-pack/plugin/esql/compute/src/main/java/org/elasticsearch/compute/aggregation/FirstValueBytesRefAggregator.java

@@ -230,6 +230,9 @@ public Block toFinal(DriverContext driverContext, IntVector selected) {
 
         @Override
         public void close() {
+            for (int i = 0; i < valueState.size(); i++) {
+                Releasables.closeWhileHandlingException(valueState.get(i));
+            }
             Releasables.close(valueState, timestampState, seen);
         }
     }

x-pack/plugin/esql/qa/testFixtures/src/main/resources/observability.csv-spec

@@ -21,17 +21,3 @@ hourly:date              | event_duration:long | message:keyword
 2023-10-23T12:00:00.000Z | 3450233             | Connected to 10.1.0.3
 2023-10-23T13:00:00.000Z | 1232382             | Disconnected
 ;
-
-
-first_grouped_long
-required_capability: fn_first_last
-FROM sample_data
-| STATS event_duration = first_value(event_duration) BY hourly = BUCKET(@timestamp, 1 hour) 
-| SORT hourly
-| KEEP hourly, event_duration
-;
-
-hourly:date              | event_duration:long
-2023-10-23T12:00:00.000Z | 3450233            
-2023-10-23T13:00:00.000Z | 1232382            
-;