# 模块 本章节负责介绍Elasticsearch包含的各个模块的功能，每个模块的配置都可以通过如下方式进行配置： **静态的** 这些配置项必须基于节点来进行设置，在启动节点前可以通过`elasticsearch.yml`配置文件、环境变量、命令行参数方式来进行配置。他们必须明确地在集群中的每个节点上进行设置。 **动态的** 这些配置可以通过群集的[cluster-update-settings](https://www.elastic.co/guide/en/elasticsearch/reference/current/cluster-update-settings.html) API进行动态更新。 本节介绍的模块有： [Cluster-level routing and shard allocation（集群级别的路由与分片分配）](https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-cluster.html)） *用来控制在何处、何时、以及如何给节点分配分片。* [Discovery（发现）](https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-discovery.html) *构成一个集群的节点彼此之间是如何发现的。* Global index-related settings. [Gateway（网关）](https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-gateway.html) *集群启动恢复前需要多少个节点加入。* [HTTP](https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-http.html) *用来控制配置`HTTP REST`接口。* [Indices（索引）](https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-indices.html) *所有跟索引相关的设置。* [Network（网络）](https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-network.html) *控制默认的网络设置。* [Node client（节点客户端）](https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-node.html) *一个加入集群的Java客户端节点，但不能保存数据或作为主节点。* [Painless](https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-scripting-painless.html) *Elasticsearch内置的脚本语言，遵循尽可能的安全设计。* [Plugins（插件）](https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-plugins.html) *通过插件来扩展Elasticsearch的功能。* [Scripting（脚本）](https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-scripting.html) *通过Lucene表达式、Groovy、Python、以及Javascript来自定义脚本。你也可以使用内置的脚本语言[Painless](https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-scripting-painless.html)。* [Snapshot/Restore（快照/还原）](https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-snapshots.html) *通过快照与还原模块来备份你的数据。* [Thread pools（线程池）](https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-threadpool.html) *Elasticsearch专用的线程池的信息。* [Transport（传输）](https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-transport.html) *Elasticsearch内部各节点之间的网络传输层通信配置。* [Tribe nodes](https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-tribe.html) *Tribe节点能加入一个或多个集群，并作为它们之间的联合客户端。* [Cross cluster Search（跨集群搜索）](https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-cross-cluster-search.html) *跨集群搜索功能可以通过一个不加入集群、并且能作为它们之间的联合客户端来实现一个以上集群的搜索。*