Elasticsearch getting killed automatically

i have a setup of elk 6.5.4. Earlier it was working fine now it is giving me error .It is getting killed automatically and logs are also not getting generated.
this is my error.

   [oes_setup@appserver2 elasticsearch-6.5.4]$ bin/elasticsearch
    [oes_setup@appserver2 elasticsearch-6.5.4]$

Kindly suggest me the solution.

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