Reindexing with a script

Reindex is a new functionality introduced in Elasticsearch 5.x for automatically reindexing your data in a new index. This action is often done for a variety of reasons, mainly mapping changes due to an improvement in mappings.

Getting ready

You need an up-and-running Elasticsearch installation as we described in the Downloading and installing Elasticsearch recipe in Chapter 2, Downloading and Setup.

To execute curl via the command-line you need to install curl for your operating system.

To correctly execute the following commands, you need an index populated with the chapter_09/populate_for_scripting.sh script available in the online code and Javascript/Python language scripting plugins installed.

How to do it...

For reindexing with a script, we will perform the following steps:

1. We create the destination index, because it's not created by reindex API:

               curl -XPUT 'http://127.0.0.1:9200/reindex-test-index?
               pretty=true' -d '{"mappings": {"test-type...