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In addition to `_source`, the following variables are available through the `ctx` map: `_index`, `_type`, `_id`, `_version`, `_routing`, `_parent`, `_timestamp`, `_ttl`. Some of these fields are more useful still within the context of an Update By Query, see #1607, #2230, #2231.
The Elasticsearch docs are in AsciiDoc format and can be built using the Elasticsearch documentation build process