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User Agent processor

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User Agent processor

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The user_agent processor extracts details from the user agent string a browser sends with its web requests. This processor adds this information by default under the user_agent field.

The ingest-user-agent module ships by default with the regexes.yaml made available by uap-java with an Apache 2.0 license. For more details see https://github.com/ua-parser/uap-core.

Using the user_agent Processor in a Pipeline

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Table 58. User-agent options

Name	Required	Default	Description
`field`	yes	-	The field containing the user agent string.
`target_field`	no	user_agent	The field that will be filled with the user agent details.
`regex_file`	no	-	The name of the file in the `config/ingest-user-agent` directory containing the regular expressions for parsing the user agent string. Both the directory and the file have to be created before starting Elasticsearch. If not specified, ingest-user-agent will use the regexes.yaml from uap-core it ships with (see below).
`properties`	no	[`name`, `major`, `minor`, `patch`, `build`, `os`, `os_name`, `os_major`, `os_minor`, `device`]	Controls what properties are added to `target_field`.
`ignore_missing`	no	`false`	If `true` and `field` does not exist, the processor quietly exits without modifying the document
`ecs`	no	`false`	Whether to return the output in Elastic Common Schema format. NOTE: ECS format will be the default in Elasticsearch 7.0 and non-ECS format is deprecated.

Here is an example that adds the user agent details to the user_agent field based on the agent field:

PUT _ingest/pipeline/user_agent
{
  "description" : "Add user agent information",
  "processors" : [
    {
      "user_agent" : {
        "field" : "agent",
        "ecs" : true
      }
    }
  ]
}
PUT my_index/_doc/my_id?pipeline=user_agent
{
  "agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36"
}
GET my_index/_doc/my_id

Which returns

{
  "found": true,
  "_index": "my_index",
  "_type": "_doc",
  "_id": "my_id",
  "_version": 1,
  "_seq_no": 22,
  "_primary_term": 1,
  "_source": {
    "agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36",
    "user_agent": {
      "name": "Chrome",
      "original": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_5) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/51.0.2704.103 Safari/537.36",
      "version": "51.0.2704",
      "os": {
        "name": "Mac OS X",
        "version": "10.10.5",
        "full": "Mac OS X 10.10.5"
      },
      "device" : {
        "name" : "Other"
      },
    }
  }
}

Using a custom regex file

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To use a custom regex file for parsing the user agents, that file has to be put into the config/ingest-user-agent directory and has to have a .yaml filename extension. The file has to be present at node startup, any changes to it or any new files added while the node is running will not have any effect.

In practice, it will make most sense for any custom regex file to be a variant of the default file, either a more recent version or a customised version.

The default file included in ingest-user-agent is the regexes.yaml from uap-core: https://github.com/ua-parser/uap-core/blob/master/regexes.yaml

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