when I restart the logstash the logstash.log shows as below:
{:timestamp=>"2015-11-24T09:30:18.155000+0800", :message=>"SIGTERM received. Shutting down the pipeline.", :level=>:warn}
{:timestamp=>"2015-11-24T09:33:07.125000+0800", :message=>"SIGTERM received. Shutting down the pipeline.", :level=>:warn}
{:timestamp=>"2015-11-24T09:41:35.488000+0800", :message=>"SIGTERM received. Shutting down the pipeline.", :level=>:warn}
{:timestamp=>"2015-11-24T09:50:26.245000+0800", :message=>"SIGTERM received. Shutting down the pipeline.", :level=>:warn}
{:timestamp=>"2015-11-24T10:01:32.011000+0800", :message=>"SIGTERM received. Shutting down the pipeline.", :level=>:warn}
{:timestamp=>"2015-11-24T10:07:33.039000+0800", :message=>"SIGTERM received. Shutting down the pipeline.", :level=>:warn}
{:timestamp=>"2015-11-24T10:10:27.160000+0800", :message=>"SIGTERM received. Shutting down the pipeline.", :level=>:warn}
{:timestamp=>"2015-11-24T10:25:35.081000+0800", :message=>"SIGTERM received. Shutting down the pipeline.", :level=>:warn}
{:timestamp=>"2015-11-24T11:05:12.113000+0800", :message=>"SIGTERM received. Shutting down the pipeline.", :level=>:warn}
{:timestamp=>"2015-11-24T11:08:55.082000+0800", :message=>"SIGTERM received. Shutting down the pipeline.", :level=>:warn}
{:timestamp=>"2015-11-24T11:26:38.940000+0800", :message=>"SIGTERM received. Shutting down the pipeline.", :level=>:warn}
{:timestamp=>"2015-11-24T11:28:57.167000+0800", :message=>"SIGTERM received. Shutting down the pipeline.", :level=>:warn}
{:timestamp=>"2015-11-24T11:52:25.516000+0800", :message=>"SIGTERM received. Shutting down the pipeline.", :level=>:warn}
{:timestamp=>"2015-11-24T11:56:09.519000+0800", :message=>"SIGTERM received. Shutting down the pipeline.", :level=>:warn}
{:timestamp=>"2015-11-24T12:09:03.295000+0800", :message=>"SIGTERM received. Shutting down the pipeline.", :level=>:warn}
anyone can help me? what should I do to fix it?