Logstash HTTP client

I have an Elasticsearch cluster running on AWS which has an Elastic Load balancer(ELB) in front of it. I am scanning the ELB log file to find the clients writing to the Elasticsearch cluster. Logstash is also one of the clients writing to it. However when I try to filter the log files using the user_agent string, I cannot find anything resembling Logstash. What user_agent string does Logstash's HTTP clinet use when writing to Elasticsearch ?

Probably "Manticore 0.9.1" or somesuch.

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