Too many cached tokens with illegal_state_exception error

While doing bulk request to bulk API I got response with errors:

Type: (string) (len=23) "illegal_state_exception",
Reason: (string) (len=30) "Too many cached tokens (> 100)"

I tried to Google this Too many cached tokens (> 100) error, but found nothing.
Please help me to understand the problem.

ES version: 7.4.1


What do your Elasticsearch logs show?
What is the full error from Elasticsearch?

There is a bug -

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