Logstash configuration for Cloudfront logs

cloudfront-logstash.conf

input {
  s3 {
    bucket => "<S3_BUCKET_NAME_WITH_CLOUDFRONT_LOGS>"
    prefix => "PREFIX_FOR_LOG_FILES (CF DISTRIBUTION NAME)"
    region => "BUCKET_REGION"
  }
}

filter {
  grok {
    match => { "message" => "(?<timestamp>%{YEAR}-%{MONTHNUM}-%{MONTHDAY}\t%{TIME})\t%{WORD:x_edge_location}\t(?:%{NUMBER:sc_bytes:int}|-)\t%{IPORHOST:clientip}\t%{WORD:cs_method}\t%{HOSTNAME:cs_host}\t%{NOTSPACE:cs_uri_stem}\t%{NUMBER:sc_status:int}\t%{GREEDYDATA:referrer}\t%{GREEDYDATA:agent}\t%{GREEDYDATA:cs_uri_query}\t%{GREEDYDATA:cookies}\t%{WORD:x_edge_result_type}\t%{NOTSPACE:x_edge_request_id}\t%{HOSTNAME:x_host_header}\t%{URIPROTO:cs_protocol}\t%{INT:cs_bytes:int}\t%{GREEDYDATA:time_taken:float}\t%{GREEDYDATA:x_forwarded_for}\t%{GREEDYDATA:ssl_protocol}\t%{GREEDYDATA:ssl_cipher}\t%{GREEDYDATA:x_edge_response_result_type}" }
  }

  mutate {
    add_field => [ "listener_timestamp", "%{date} %{time}" ]
  }

  date {
    match => [ "listener_timestamp", "yy-MM-dd HH:mm:ss" ]
    target => "@timestamp"
  }

  geoip {
    source => "c_ip"
  }

  useragent {
    source => "User_Agent"
    target => "useragent"
  }

  mutate {
    remove_field => ["date", "time", "listener_timestamp", "cloudfront_version", "message", "cloudfront_fields", "User_Agent"]
  }
}

output {
  amazon_es {
    hosts => ["<ELASTIC_SEARCH_HOST>"]
    region => "REGION (IF AWS ES)"
    index => "cloudfront-logs-%{+YYYY.MM.dd}"
    template => "<PATH_TO_TEMPLATE>"
  }
}

cloudfront.template.json

{
  "template": "cloudfront-logs-*",
  "mappings": {
    "logs": {
      "_source": {
        "enabled": false
      },
      "_all": {
        "enabled": false
      },
      "dynamic_templates": [
        {
          "string_fields": {
            "mapping": {
              "index": "not_analyzed",
              "type": "string"
            },
            "match_mapping_type": "string",
            "match": "*"
          }
        }
      ],
      "properties": {
        "geoip"  : {
          "dynamic": true,
          "properties" : {
            "ip": { "type": "ip" },
            "location" : { "type" : "geo_point" },
            "latitude" : { "type" : "float" },
            "longitude" : { "type" : "float" }
          }
        }
      }
    }
  }
}