Elasticsearch error after running 4 month

Elastic Stack Elasticsearch
1

i try to implementation elk stackin my network and its worked until 4 month, kibana cant detect elasticseach . i try to restart service elasticsearch . its can stop but can't start again.
in elasticsearch log have error

at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:748)
[2018-01-23 23:59:07,954][WARN ][transport ] [Arachne] Received response for a request that has timed out, sent [34393ms] ago, timed out [15958ms] ago, action [cluster:monitor/nodes/stats[n]], node [{Arachne}{L87N_pgiQyKn_uXOIqpz5w}{localhost}{127.0.0.1:9300}], id [39858775]
[2018-01-23 23:59:54,390][DEBUG][action.admin.cluster.node.stats] [Arachne] failed to execute on node [L87N_pgiQyKn_uXOIqpz5w]
ReceiveTimeoutTransportException[[Arachne][127.0.0.1:9300][cluster:monitor/nodes/stats[n]] request_id [39858777] timed out after [15871ms]]
at org.elasticsearch.transport.TransportService$TimeoutHandler.run(TransportService.java:698)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:748)

2

How many nodes do you have in your Elasticsearch cluster, which version are you using?

3

only 1 node
i'm use elasticseach v. 2.

4

How many indices and shards do you have in the cluster? How much heap do you have assigned?

5

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