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Increase Elasticsearch Pool Size

Used:

  • elasticsearch v6.2.4

Elasticsearch has common thread defaults for bulk requests. If you need to tune or gap certain problems, you can change the thread and thread pool size settings in elasticsearch.yml. In general it is not recommended to tweak anything! Use it at your own risk!

Use the thread_pool API to check current settings.

GET _cat/thread_pool?h=host,name,min,max,queue,queue_size&v&s=name
host         name                min max queue queue_size
alpha        bulk                 32  32     0        200
beta         bulk                 32  32     0        200
gamma        bulk                 32  32     0        200

Change in elasticsearch.yml the pool size:

thread_pool:
  bulk:
    queue_size: 500

Perform a rolling restart and you will see:

host         name                min max queue queue_size
alpha        bulk                 32  32     0        500
beta         bulk                 32  32     0        500
gamma        bulk                 32  32     0        500