Failed to get setting group for [threadpool.] setting prefix and setting [threadpool.bulk] because of a missing '.'

[marc . falzon]

Hello there

I noticed the following warning message in my nodes logs when starting:

[2015-04-30 12:40:13,265][INFO ][node                     ] [***server***] 
started
[2015-04-30 12:40:32,154][WARN ][node.settings            ] [***server***] 
failed to refresh settings for 
[org.elasticsearch.threadpool.ThreadPool$ApplySettings@1ca801ce]
org.elasticsearch.common.settings.SettingsException: Failed to get setting 
group for [threadpool.] setting prefix and setting [threadpool.bulk] 
because of a missing '.'
        at 
org.elasticsearch.common.settings.ImmutableSettings.getGroups(ImmutableSettings.java:527)
        at 
org.elasticsearch.common.settings.ImmutableSettings.getGroups(ImmutableSettings.java:505)
        at 
org.elasticsearch.threadpool.ThreadPool.updateSettings(ThreadPool.java:396)
        at 
org.elasticsearch.threadpool.ThreadPool$ApplySettings.onRefreshSettings(ThreadPool.java:682)
        at 
org.elasticsearch.node.settings.NodeSettingsService.clusterChanged(NodeSettingsService.java:84)
        at 
org.elasticsearch.cluster.service.InternalClusterService$UpdateTask.run(InternalClusterService.java:428)
        at 
org.elasticsearch.common.util.concurrent.PrioritizedEsThreadPoolExecutor$TieBreakingPrioritizedRunnable.run(PrioritizedEsThreadPoolExecutor.java:134)
        at 
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
        at 
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
        at java.lang.Thread.run(Thread.java:745)

Here are the current cluster settings:

curl http://localhost:9200/_cluster/settings?pretty
{
  "persistent" : {
    "indices" : {
      "store" : {
        "throttle" : {
          "max_bytes_per_sec" : "40mb"
        }
      }
    },
    "threadpool" : {
      "bulk" : "250"
    },
    "cluster" : {
      "routing" : {
        "allocation" : {
          "enable" : "all",
          "balance" : {
            "shard" : "0.9f"
          },
          "disable_allocation" : "false"
        }
      }
    }
  },
  "transient" : {
    "cluster" : {
      "routing" : {
        "allocation" : {
          "enable" : "all"
        }
      }
    }
  }
}

Is there anything wrong with my settings? We tried to change the 
`threadpool.bulk` setting months ago, but it doesn't seem to have been 
taken into account (bulk queue still caped at default value). We currently 
use version 1.2.3, and are in the process of upgrading to 1.5.x performing 
rolling upgrades.

Cheers,

m.

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