Calling Secondary Index gets "error calling MarshalJSON "

java sdk master branch failed on secondary index with both view and gsi.
I use simple query to issue secondary index

Exceptions
================================================================================

[108.92 INFO] (LineGobbler doFilter:115) +++ Following exception has internal ID: 1
[108.92 INFO] (SDKD log:137) at com.couchbase.client.java.CouchbaseAsyncBucket$25$2.call(CouchbaseAsyncBucket.java:891)
at com.couchbase.client.java.CouchbaseAsyncBucket$25$2.call(CouchbaseAsyncBucket.java:886)
at rx.internal.operators.OperatorMap$1.onNext(OperatorMap.java:55)
at rx.internal.operators.NotificationLite.accept(NotificationLite.java:150)
at rx.internal.operators.TakeLastQueueProducer.emit(TakeLastQueueProducer.java:98)
at rx.internal.operators.TakeLastQueueProducer.startEmitting(TakeLastQueueProducer.java:45)
at rx.internal.operators.OperatorTakeLast$1.onCompleted(OperatorTakeLast.java:59)
at rx.internal.operators.OperatorScan$2.onCompleted(OperatorScan.java:121)
at rx.internal.operators.OperatorMap$1.onCompleted(OperatorMap.java:44)
at rx.internal.operators.NotificationLite.accept(NotificationLite.java:140)
at rx.internal.operators.OperatorObserveOn$ObserveOnSubscriber.pollQueue(OperatorObserveOn.java:189)
at rx.internal.operators.OperatorObserveOn$ObserveOnSubscriber.access$000(OperatorObserveOn.java:65)
at rx.internal.operators.OperatorObserveOn$ObserveOnSubscriber$2.call(OperatorObserveOn.java:153)
at rx.internal.schedulers.ScheduledAction.run(ScheduledAction.java:47)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
[108.92 INFO] (SDKD log:137) Caused by: com.couchbase.client.core.CouchbaseException: Query Error -

{"msg":"json: error calling MarshalJSON for type *plan.Sequence: json: error calling MarshalJSON for type plan.Operator: json: error calling MarshalJSON for type *plan.Sequence: json: error calling MarshalJSON for type plan.Operator: json: error calling MarshalJSON for type expression.Expression: invalid character '$' looking for beginning of value","code":4000}

[108.92 INFO] (LineGobbler doFilter:115) +++ Following exception has internal ID: 3