Deleting by query
We saw how to delete a document in the recipe Deleting a document in Chapter 4, Basic Operations. Deleting a document is very fast but it requires knowing the document ID.
Elasticsearch provides a call to delete all the documents that match a query via an additional module called reindex, which is installed by default.
Getting ready
You will need an up-and-running Elasticsearch installation as used in the Downloading and installing Elasticsearch recipe in Chapter 2, Downloading and Setup.
To execute curl via a command-line you need to install curl for your operating system.
To correctly execute the following commands you will need an index populated with the chapter_05/populate_query.sh script available in the online code.
How to do it...
In order to delete by query, we will perform the following steps:
From the command line, we will execute a query as follows:
curl -XPOST 'http://127.0.0.1:9200/test-index/test- type/_delete_by_query?pretty' -d '{"query":{"match_all...
