elasticsearch/docs/extend/plugin-descriptor-file-classic.md

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https://www.elastic.co/guide/en/elasticsearch/plugins/current/plugin-descriptor-file-classic.html

The plugin descriptor file for classic plugins [plugin-descriptor-file-classic]

The classic plugin descriptor file is a Java properties file called plugin-descriptor.properties that describes the plugin. The file is automatically created if you are using {{es}}'s Gradle build system. If you’re not using the gradle plugin, you can create it manually using the following template.

# Elasticsearch plugin descriptor file
# This file must exist as 'plugin-descriptor.properties' or 'stable-plugin-descriptor.properties inside a plugin.
#
## example plugin for "foo"
#
# foo.zip <-- zip file for the plugin, with this structure:
# |____   <arbitrary name1>.jar <-- classes, resources, dependencies
# |____   <arbitrary nameN>.jar <-- any number of jars
# |____   plugin-descriptor.properties <-- example contents below:
#
# classname=foo.bar.BazPlugin
# description=My cool plugin
# version=6.0
# elasticsearch.version=6.0
# java.version=1.8
#
## mandatory elements for all plugins:
#
# 'description': simple summary of the plugin
description=${description}
#
# 'version': plugin's version
version=${version}
#
# 'name': the plugin name
name=${name}
#
# 'java.version': version of java the code is built against
# use the system property java.specification.version
# version string must be a sequence of nonnegative decimal integers
# separated by "."'s and may have leading zeros
java.version=${javaVersion}
#
# 'elasticsearch.version': version of elasticsearch compiled against.
# Plugins implementing plugin-api.jar this version only has to match a major version of the ES server
# For all other plugins it has to be the same as ES server version
elasticsearch.version=${elasticsearchVersion}
## optional elements for plugins:
<% if (classname) { %>
#
# 'classname': the name of the class to load, fully-qualified. Only applies to
# "isolated" plugins
classname=${classname}
<% } %>
<% if (modulename) { %>
#
# 'modulename': the name of the module to load classname from. Only applies to
# "isolated" plugins. This is optional. Specifying it causes the plugin
# to be loaded as a module.
modulename=${modulename}
<% } %>
<% if (extendedPlugins) { %>
#
#  'extended.plugins': other plugins this plugin extends through SPI
extended.plugins=${extendedPlugins}
<% } %>
<% if (hasNativeController) { %>
#
# 'has.native.controller': whether or not the plugin has a native controller
has.native.controller=${hasNativeController}
<% } %>
<% if (licensed) { %>
# This plugin requires that a license agreement be accepted before installation
licensed=${licensed}
<% } %>

Properties [_properties_2]

Element	Type	Description
description	String	simple summary of the plugin
version	String	plugin’s version
name	String	the plugin name
classname	String	the name of the class to load,fully-qualified.
extended.plugins	String	other plugins this plugin extends throughSPI.
modulename	String	the name of the module to load classnamefrom. Only applies to "isolated" plugins. This is optional. Specifying it causesthe plugin to be loaded as a module.
java.version	String	version of java the code is built against.Use the system property java.specification.version. Version string must be asequence of nonnegative decimal integers separated by "."'s and may have leadingzeros.
elasticsearch.version	String	version of {{es}} compiled against.