Easticsearch throw the no such index exception

Easticsearch throw the exception: [type=index_not_found_exception, reason=no such index]

Other than not creating an index, what else could have caused this exception. I was sure created the index but also throw the exception when I execute the query.

concurrent query(QPS) too high? or a not exist field SORT? or other resons?

In which context is this happening? Which version?