Remove java.time date-time parsing fallback (#116572)

Only use the ISO date-time parser now

Author: thecoop

modules/data-streams/src/yamlRestTest/resources/rest-api-spec/test/data_stream/150_tsdb.yml

@@ -244,17 +244,17 @@ TSDB failures go to failure store:
         refresh: true
         body:
           - '{ "create": { "_index": "fs-k8s"} }'
-          - '{"@timestamp":"2021-04-28T01:00:00ZZ", "metricset": "pod", "k8s": {"pod": {"name": "cat", "uid":"947e4ced-1786-4e53-9e0c-5c447e959507", "ip": "10.10.55.1", "network": {"tx": 2001818691, "rx": 802133794}}}}'
+          - '{"@timestamp":"2021-04-28T01:00:00Z", "metricset": "pod", "k8s": {"pod": {"name": "cat", "uid":"947e4ced-1786-4e53-9e0c-5c447e959507", "ip": "10.10.55.1", "network": {"tx": 2001818691, "rx": 802133794}}}}'
           - '{ "create": { "_index": "k8s"} }'
-          - '{ "@timestamp": "2021-04-28T01:00:00ZZ", "metricset": "pod", "k8s": {"pod": {"name": "cat", "uid":"947e4ced-1786-4e53-9e0c-5c447e959507", "ip": "10.10.55.1", "network": {"tx": 2001818691, "rx": 802133794}}}}'
+          - '{ "@timestamp": "2021-04-28T01:00:00Z", "metricset": "pod", "k8s": {"pod": {"name": "cat", "uid":"947e4ced-1786-4e53-9e0c-5c447e959507", "ip": "10.10.55.1", "network": {"tx": 2001818691, "rx": 802133794}}}}'
           - '{ "create": { "_index": "fs-k8s"} }'
           - '{ "metricset": "pod", "k8s": {"pod": {"name": "cat", "uid":"947e4ced-1786-4e53-9e0c-5c447e959507", "ip": "10.10.55.1", "network": {"tx": 2001818691, "rx": 802133794}}}}'
           - '{ "create": { "_index": "fs-k8s"} }'
-          - '{ "@timestamp":"2000-04-28T01:00:00ZZ", "metricset": "pod", "k8s": {"pod": {"name": "cat", "uid":"947e4ced-1786-4e53-9e0c-5c447e959507", "ip": "10.10.55.1", "network": {"tx": 2001818691, "rx": 802133794}}}}'
+          - '{ "@timestamp":"2000-04-28T01:00:00Z", "metricset": "pod", "k8s": {"pod": {"name": "cat", "uid":"947e4ced-1786-4e53-9e0c-5c447e959507", "ip": "10.10.55.1", "network": {"tx": 2001818691, "rx": 802133794}}}}'
           - '{ "create": { "_index": "k8s"} }'
           - '{"metricset": "pod", "k8s": {"pod": {"name": "cat", "uid":"947e4ced-1786-4e53-9e0c-5c447e959507", "ip": "10.10.55.1", "network": {"tx": 2001818691, "rx": 802133794}}}}'
           - '{ "create": { "_index": "k8s"} }'
-          - '{ "@timestamp":"2000-04-28T01:00:00ZZ", "metricset": "pod", "k8s": {"pod": {"name": "cat", "uid":"947e4ced-1786-4e53-9e0c-5c447e959507", "ip": "10.10.55.1", "network": {"tx": 2001818691, "rx": 802133794}}}}'
+          - '{ "@timestamp":"2000-04-28T01:00:00Z", "metricset": "pod", "k8s": {"pod": {"name": "cat", "uid":"947e4ced-1786-4e53-9e0c-5c447e959507", "ip": "10.10.55.1", "network": {"tx": 2001818691, "rx": 802133794}}}}'
   - is_true: errors
 
   # Successfully indexed to backing index