Logstash service stops

[34Bearman]

The Logstash service is stopping on the server. I can restart it but it will fail again in less than 5 minutes. Looked in the /var/logs/logstash.log and I see this entry:

{:timestamp=>"2015-08-18T15:39:17.899000-0500", :message=>"retrying failed action with response code: 503", :level=>:warn}

Ran a health check and results are below:

curl -XGET 'http://localhost:9200/_cluster/health?pretty=true'
{
"cluster_name" : "ee5fd37c-6cac-43b1-9d83-70df908d260c",
"status" : "yellow",
"timed_out" : false,
"number_of_nodes" : 1,
"number_of_data_nodes" : 1,
"active_primary_shards" : 311,
"active_shards" : 311,
"relocating_shards" : 0,
"initializing_shards" : 0,
"unassigned_shards" : 311,
"number_of_pending_tasks" : 0,
"number_of_in_flight_fetch" : 0
}

[Box293]

Can you give us the last 20 lines of the logstash.log once it dies.