ElasticSearch query via curl

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http://serverfault.com – I have an logstash instance with ElasticSearch Index. I trying to run some queries against to this index via command line, because I would like to monitor some log items in this index, because I use logstash as a central logging server. But I am totall missed in query language, and I cannot find a correct part of documentation for solve my problem. I trying to search some specific log messages. My mapping seems as following: { "syslog": { "properties": { "@fields": { "dynamic": "true", "properties": { "received_at": { "type": "date", (HowTos)