Elasticsearch index template for logstash that contains additional NGINX fields

logstash.index.json

{
    "template" : "logstash*",
    "settings" : {
        "number_of_shards" : 5,
        "index.cache.field.type" : "soft",
        "index.refresh_interval" : "5s",
        "index.store.compress.stored" : true,
        "index.query.default_field" : "@message",
        "index.routing.allocation.total_shards_per_node" : 5
    },
    "mappings" : {
        "_default_" : {
            "_all" : {"enabled" : false},
            "properties" : {
               "@message": { "type": "string", "index": "analyzed" },
               "@source": { "type": "string", "index": "not_analyzed" },
               "@source_host": { "type": "string", "index": "not_analyzed" },
               "@source_path": { "type": "string", "index": "not_analyzed" },
               "@tags": { "type": "string", "index": "not_analyzed" },
               "@timestamp": { "type": "date", "index": "not_analyzed" },
               "@type": { "type": "string", "index": "not_analyzed" }
            }
        }
    }
}