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?