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.

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.

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.

void

No expected return value.

The standard Painless API is available.

To run the example, first install the eCommerce sample data.

The following request copies all documents from the kibana_sample_data_ecommerce index to a new index called data_ecommerce_usd. During this process, a script is used to convert all monetary values to a new currency using a specified exchange rate in the params.

POST /_reindex
{
  "source": {
    "index": "kibana_sample_data_ecommerce"
  },
  "dest": {
    "index": "data_ecommerce_usd"
  },
  "script": {
    "source": """
      float er = (float) params.exchange_rate;
      ctx._source.currency = params.target_currency;

      // Convert all prices to dollar
      ctx._source.taxful_total_price = Math.round(ctx._source.taxful_total_price * er * 100) / 100;
      ctx._source.taxless_total_price = Math.round(ctx._source.taxless_total_price * er * 100) / 100;

      for (product in ctx._source.products) {
        product.price = Math.round(product.price * er * 100) / 100;
        product.base_price = Math.round(product.base_price * er * 100) / 100;
        product.taxful_price = Math.round(product.taxful_price * er * 100) / 100;
        product.taxless_price = Math.round(product.taxless_price * er * 100) / 100;
      }
    """,
    "lang": "painless",
    "params": {
      "exchange_rate": 1.10,
      "target_currency": "USD"
    }
  }
}

1. Cast parameter to float to ensure proper decimal calculations