A large number of pending tasks lock the elastic

Elastic Stack Elasticsearch
1

Hello,
Elasticsearch version 5.6.10
Application - graylog
Suddenly a large amount of pending tasks is created, preventing processing data to indices.
All of type put-mapping , 300-400 tasks
insertOrder timeInQueue priority source
45061687 4.3s HIGH put-mapping

After several hours tasks disappear and application works properly.
Please any suggestions, how to "release" ES when such amount of pending tasks is created?
Thanks in advance

2

The issue resolved. It was the index.mapping.total_fields.limit issue

3

This is the issue addressed by
#48867 which will be released in 7.6.0.

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