Failed to process cluster event (put-mapping) within 30s

Elastic Stack Elasticsearch
1

hi, guys
failed to process cluster event (put-mapping) within 30s problem often happened in my cluster.
My es cluster was used for log management, lots of index created everyday and I use dynamic mapping adjust to doc indexed.
My cluster config is:

  es version ： 5.4.3.  
  master node  num：3
  datenode num: 50
   index num:  8000
  shard num: 20000

When mapping update timeout, the index speed decreases a lot.
So How to solve or debug this problem? Any suggestions?

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