Documents stored in Elasticsearch can be updated during their lives. There are two available solutions to do this operation in Elasticsearch: adding a new document or using the update call.
The update call can work in two ways:
Providing a script that uses the update strategy
Providing a document that must be merged with the original one
The main advantage of an update versus an index is the networking reduction.
You 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 the command line, you need to install curl for your operative system.
To correctly execute the following commands, use the indexed document in the Indexing a document recipe.
To use dynamic scripting languages, they must be enabled: see Chapter 9, Scripting.
