Delete an Index

现在我们来试试看怎么删除索引。先试着将刚才创建的顾客索引删掉，然后再列出所有的索引清单，看看顾客索引是不是真的被成功删掉了。

curl -XDELETE 'localhost:9200/customer?pretty'
curl 'localhost:9200/_cat/indices?v'

响应信息：

curl -XDELETE 'localhost:9200/customer?pretty'
{
  "acknowledged" : true
}
curl 'localhost:9200/_cat/indices?v'
health index pri rep docs.count docs.deleted store.size pri.store.size

这个响应信息意味着我们的确已经成功把顾客索引给删了，现在集群又回到了最初的一无所有的样子了（鳖再说你一无所有了。。。你这不是还有病嘛(⊙_⊙)）。

在我们继续深入学习之前，我们现在简单温习下我们之前所学习过的一些 API 命令：

curl -XPUT 'localhost:9200/customer'
curl -XPUT 'localhost:9200/customer/external/1' -d '
{
  "name": "John Doe"
}'
curl 'localhost:9200/customer/external/1'
curl -XDELETE 'localhost:9200/customer'

如果你够细心，或许你已经发现这些命令其实有一个通用的模式。这个模式可以简单描述成：

curl -X<REST 动作名> <节点>:<端口号>/<索引名>/<类型名>/<ID>

所有的 API 命令都是采用的这种 REST 访问模式，所以如果你早早地就记住它，那你在学习 Elasticsearch 时就已经有了一个良好的开始。

Now let’s delete the index that we just created and then list all the indexes again:

curl -XDELETE 'localhost:9200/customer?pretty'
curl 'localhost:9200/_cat/indices?v'

And the response:

curl -XDELETE 'localhost:9200/customer?pretty'
{
  "acknowledged" : true
}
curl 'localhost:9200/_cat/indices?v'
health index pri rep docs.count docs.deleted store.size pri.store.size

Which means that the index was deleted successfully and we are now back to where we started with nothing in our cluster.

Before we move on, let’s take a closer look again at some of the API commands that we have learned so far:

curl -XPUT 'localhost:9200/customer'
curl -XPUT 'localhost:9200/customer/external/1' -d '
{
  "name": "John Doe"
}'
curl 'localhost:9200/customer/external/1'
curl -XDELETE 'localhost:9200/customer'

If we study the above commands carefully, we can actually see a pattern of how we access data in Elasticsearch. That pattern can be summarized as follows:

curl -X<REST Verb> <Node>:<Port>/<Index>/<Type>/<ID>

This REST access pattern is pervasive throughout all the API commands that if you can simply remember it, you will have a good head start at mastering Elasticsearch.