primary container 主要容器 ; 主容器
Initially, with one container, there are 101 primary shards and no replica shards in it.
最初，在一个容器中有101个主碎片，没有任何复制碎片。
When the second container is added, 50 primary shards are moved to the second container.
添加第二个容器时，将50个主碎片移动到第二个容器。
ServletContext: the primary mechanism to communicate with the container and store attributes for the servlet.
ServletContext：用于与容器通信和存储servlet的属性的主要机制。
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