_tasks - Client doesn't expect the response to have objects under json path `response.failures`

Start with client.tasks().get(...waitForCompletion(true)) and the co.elastic.clients.elasticsearch.tasks.Status deserializer, focusing on the response.failures[0] path shown in the exception. The response example and the RestClientTransport stack trace are the available entry points. Done means this object-valued failures response can be decoded without UnexpectedJsonEventException.

Java API client version

7.17

Java version

18

Elasticsearch Version

7.17

Problem description

client.tasks().get(b -> b.taskId(task).waitForCompletion(true)).get(); doesn't expect the response to have objects under json path response.failures

# HTTP/1.1 200 OK
# Content-Length: 1162
# Content-Type: application/json; charset=UTF-8
# X-Cloud-Request-Id: 3GittpRzS46HyUV79VZCzw
# X-Elastic-Product: Elasticsearch
# X-Found-Handling-Cluster: e2f942535ee445bea79ae9247412057e
# X-Found-Handling-Instance: instance-0000000000
# Date: Tue, 13 Sep 2022 01:20:45 GMT
#
# {"completed":true,"task":{"node":"nRe5uM-zSpeIKPb3gV-1qw","id":28872809,"type":"transport","action":"indices:data/write/reindex","status":{"total":1,"updated":0,"created":0,"deleted":0,"batches":1,"version_conflicts":0,"noops":0,"retries":{"bulk":0,"search":0},"throttled_millis":0,"requests_per_second":-1.0,"throttled_until_millis":0},"description":"reindex from [scheme=https host=foo.com port=443 query={\n  \"match_all\" : {\n    \"boost\" : 1.0\n  }\n}][test-index1] to [remote1-test-index1][_doc]","start_time_in_millis":1663032044879,"running_time_in_nanos":30701197,"cancellable":true,"cancelled":false,"headers":{}},"response":{"took":26,"timed_out":false,"total":1,"updated":0,"created":0,"deleted":0,"batches":1,"version_conflicts":0,"noops":0,"retries":{"bulk":0,"search":0},"throttled":"0s","throttled_millis":0,"requests_per_second":-1.0,"throttled_until":"0s","throttled_until_millis":0,"failures":[{"index":"remote1-test-index1","type":"_doc","id":"p3tvNIMBc-FQCJhuIeng","cause":{"type":"illegal_argument_exception","reason":"pipeline with id [MyPipeline] does not exist"},"status":400}]}}

co.elastic.clients.json.JsonpMappingException: Error deserializing co.elastic.clients.elasticsearch.tasks.Status: co.elastic.clients.json.UnexpectedJsonEventException: Unexpected JSON event 'START_OBJECT' instead of '[KEY_NAME, VALUE_STRING, VALUE_NUMBER, VALUE_TRUE, VALUE_FALSE]' (JSON path: response.failures[0]) (line no=1, column no=957, offset=-1)
	at co.elastic.clients.json.JsonpMappingException.from0(JsonpMappingException.java:134)
	at co.elastic.clients.json.JsonpMappingException.from(JsonpMappingException.java:125)
	at co.elastic.clients.json.JsonpDeserializerBase$ArrayDeserializer.deserialize(JsonpDeserializerBase.java:320)
	at co.elastic.clients.json.JsonpDeserializerBase$ArrayDeserializer.deserialize(JsonpDeserializerBase.java:280)
	at co.elastic.clients.json.JsonpDeserializer.deserialize(JsonpDeserializer.java:75)
	at co.elastic.clients.json.ObjectDeserializer$FieldObjectDeserializer.deserialize(ObjectDeserializer.java:71)
	at co.elastic.clients.json.ObjectDeserializer.deserialize(ObjectDeserializer.java:180)
	at co.elastic.clients.json.ObjectDeserializer.deserialize(ObjectDeserializer.java:136)
	at co.elastic.clients.json.JsonpDeserializer.deserialize(JsonpDeserializer.java:75)
	at co.elastic.clients.json.ObjectBuilderDeserializer.deserialize(ObjectBuilderDeserializer.java:79)
	at co.elastic.clients.json.DelegatingDeserializer$SameType.deserialize(DelegatingDeserializer.java:43)
	at co.elastic.clients.json.ObjectDeserializer$FieldObjectDeserializer.deserialize(ObjectDeserializer.java:71)
	at co.elastic.clients.json.ObjectDeserializer.deserialize(ObjectDeserializer.java:180)
	at co.elastic.clients.json.ObjectDeserializer.deserialize(ObjectDeserializer.java:136)
	at co.elastic.clients.json.JsonpDeserializer.deserialize(JsonpDeserializer.java:75)
	at co.elastic.clients.json.ObjectBuilderDeserializer.deserialize(ObjectBuilderDeserializer.java:79)
	at co.elastic.clients.json.DelegatingDeserializer$SameType.deserialize(DelegatingDeserializer.java:43)
	at co.elastic.clients.transport.rest_client.RestClientTransport.decodeResponse(RestClientTransport.java:328)
	at co.elastic.clients.transport.rest_client.RestClientTransport.getHighLevelResponse(RestClientTransport.java:294)
	at co.elastic.clients.transport.rest_client.RestClientTransport.access$200(RestClientTransport.java:63)
	at co.elastic.clients.transport.rest_client.RestClientTransport$1.onSuccess(RestClientTransport.java:168)
	at org.elasticsearch.client.RestClient$FailureTrackingResponseListener.onSuccess(RestClient.java:664)
	at org.elasticsearch.client.RestClient$1.completed(RestClient.java:398)
	at org.elasticsearch.client.RestClient$1.completed(RestClient.java:392)
	at org.apache.http.concurrent.BasicFuture.completed(BasicFuture.java:122)
	at org.apache.http.impl.nio.client.DefaultClientExchangeHandlerImpl.responseCompleted(DefaultClientExchangeHandlerImpl.java:182)
	at org.apache.http.nio.protocol.HttpAsyncRequestExecutor.processResponse(HttpAsyncRequestExecutor.java:448)
	at org.apache.http.nio.protocol.HttpAsyncRequestExecutor.inputReady(HttpAsyncRequestExecutor.java:338)
	at org.apache.http.impl.nio.DefaultNHttpClientConnection.consumeInput(DefaultNHttpClientConnection.java:265)
	at org.apache.http.impl.nio.client.InternalIODispatch.onInputReady(InternalIODispatch.java:87)
	at org.apache.http.impl.nio.client.InternalIODispatch.onInputReady(InternalIODispatch.java:40)
	at org.apache.http.impl.nio.reactor.AbstractIODispatch.inputReady(AbstractIODispatch.java:121)
	at org.apache.http.impl.nio.reactor.BaseIOReactor.readable(BaseIOReactor.java:162)
	at org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvent(AbstractIOReactor.java:337)
	at org.apache.http.impl.nio.reactor.AbstractIOReactor.processEvents(AbstractIOReactor.java:315)
	at org.apache.http.impl.nio.reactor.AbstractIOReactor.execute(AbstractIOReactor.java:276)
	at org.apache.http.impl.nio.reactor.BaseIOReactor.execute(BaseIOReactor.java:104)
	at org.apache.http.impl.nio.reactor.AbstractMultiworkerIOReactor$Worker.run(AbstractMultiworkerIOReactor.java:591)
	at java.base/java.lang.Thread.run(Thread.java:833)
Caused by: co.elastic.clients.json.UnexpectedJsonEventException: Unexpected JSON event 'START_OBJECT' instead of '[KEY_NAME, VALUE_STRING, VALUE_NUMBER, VALUE_TRUE, VALUE_FALSE]'
	at co.elastic.clients.json.JsonpUtils.ensureAccepts(JsonpUtils.java:104)
	at co.elastic.clients.json.JsonpDeserializerBase$ArrayDeserializer.deserialize(JsonpDeserializerBase.java:315)
	... 36 common frames omitted