Jar invoke Elasticsearch plugin  

To execute custom code in Elasticsearch, you can write an Elasticsearch plugin. However, a plugin introduces an operational complication. To deploy a new version of an Elasticsearch plugin, you need to restart every node in the Elasticsearch cluster where the plugin is installed. This plugin loads Java code at runtime, so you can deploy new code without needing to restart the Elasticsearch nodes.

SECURITY WARNING

This plugin allows scripts to download and execute arbitrary code from the Internet. Installing it will make your information security officer cry.

Install

Install the plugin using the command:

elasticsearch-plugin install com.github.pukkaone:jar-invoke:VERSION

Usage

This plugin adds a script language named jar-invoke which implements statements to load and invoke Java code.

Require JAR file

Load JAR artifact from a Maven repository if not already loaded.

module = require(' repositoryUri ', ' jarCoordinates ')

Parameter	Description
module	name to assign to module
repositoryUri	Maven repository URI
jarCoordinates	Maven artifact coordinates, in format groupId:artifactId:version

Invoke Java static method

Invoke static method of a Java class in a loaded JAR file.

module .invoke(' className ', ' methodName ')

Parameter	Description
module	name of loaded module
className	Java class name
methodName	Java method name

Example:

hello = require('http://repository.example.com/', 'com.example:hello:1.0')
hello.invoke('com.example.Hello', 'greet')

The Java method must have accept two Map parameters:

public static Object greet(Map<String, Object> variables, Map<String, ScriptDocValues> docLookup) {

Load JAR file

Load JAR artifact from a Maven repository even if it was already loaded.

module = load(' repositoryUri ', ' jarCoordinates ')

Parameter	Description
module	name to assign to module
repositoryUri	Maven repository URI
jarCoordinates	Maven artifact coordinates, in format groupId:artifactId:version

Example:

hello = load('http://repository.example.com/', 'com.example:hello:1.0')