elasticsearch/docs/reference/scripting-languages/painless/painless-reindex-context.md

mapped_pages
https://www.elastic.co/guide/en/elasticsearch/painless/current/painless-reindex-context.html

Reindex context [painless-reindex-context]

Use a Painless script in a reindex operation to add, modify, or delete fields within each document in an original index as its reindexed into a target index.

Variables

params (Map, read-only)

User-defined parameters passed in as part of the query.

ctx['op'] (String)

The name of the operation.

ctx['_routing'] (String)

The value used to select a shard for document storage.

ctx['_index'] (String)

The name of the index.

ctx['_id'] (String)

The unique document id.

ctx['_version'] (int)

The current version of the document.

ctx['_source'] (Map)

Contains extracted JSON in a Map and List structure for the fields existing in a stored document.

Side Effects

ctx['op']

Use the default of index to update a document. Set to noop to specify no operation or delete to delete the current document from the index.

ctx['_routing']

Modify this to change the routing value for the current document.

ctx['_index']

Modify this to change the destination index for the current document.

ctx['_id']

Modify this to change the id for the current document.

ctx['_version'] (int)

Modify this to modify the version for the current document.

ctx['_source']

Modify the values in the Map/List structure to add, modify, or delete the fields of a document.

Return

void

No expected return value.

API

The standard Painless API is available.