[Error] instance of CompositeIndicesRequest that could not be handled: report this as a bug immediately!

Hi there

I'm facing issue in ES 6.5 on client nodes:

2019.06.17 21:10:30.584 
[2019-06-17T23:10:24,075][ERROR][t.b.r.e.RequestInfo ] [elasticservice-client-04] REFLECTION: Failed to set indices for type SearchTemplateRequest in req id: 398456149-95022425#4896737
 2019.06.17 21:10:30.584 
[2019-06-17T23:10:29,219][ERROR][t.b.r.e.RequestInfo ] [elasticservice-client-04] Found an instance of CompositeIndicesRequest that could not be handled: report this as a bug immediately! SearchTemplateRequest
 2019.06.17 21:10:30.584 
[2019-06-17T23:10:29,219][ERROR][t.b.r.e.RequestInfo ] [elasticservice-client-04] REFLECTION: Failed to set indices for type SearchTemplateRequest in req id: 755352931--1535133586#4896749
 2019.06.17 21:10:30.584 
[2019-06-17T23:10:24,075][ERROR][t.b.r.e.RequestInfo ] [elasticservice-client-04] Found an instance of CompositeIndicesRequest that could not be handled: report this as a bug immediately! SearchTemplateRequest

Does anybody have a clue, what does it mean?
Or how to debug this? This is probably somehow related to architecture (cross environments issue).

EDIT: Before following what I say, it would maybe better to answer the question of the expert below.


As I see:

Found an instance of CompositeIndicesRequest that could not be handled: report this as a bug immediately!

I would advise to follow the message and report it as a bug through their bug tracker. Or at least search the issues, maybe it has already been reported.

What is this package name? t.b.r.e.RequestInfo I don't think it's in elasticsearch.

Thank you for good point @dadoonet, you are right - it's probably comming from ReadOnlyRestPlugin we are using.

Similar issues reported in their bugtracker as well:

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