创建名为 test_index的索引 :
PUT test_index
注意,PUT test_index和 PUT /test_index效果是一样的。
响应:
{
"acknowledged" : true,
"shards_acknowledged" : true,
"index" : "test_index"
}
查询索引信息:
GET test_index
响应:
{
"test_index" : {
"aliases" : { },
"mappings" : { },
"settings" : {
"index" : {
"creation_date" : "1597456553836",
"number_of_shards" : "1",
"number_of_replicas" : "1",
"uuid" : "b3GPz-gCRgmdpgcgEELY2A",
"version" : {
"created" : "7080099"
},
"provided_name" : "test_index"
}
}
}
}
可以看到,分片数量number_of_shards 为1,副本数量为number_of_replicas 1 。
修改副本数量
请求:
PUT test_index/_settings
{
"index" : {
"number_of_replicas" : 3
}
}
响应:
{
"acknowledged" : true
}
注意,当副本创建完成后(可能耗时很长),才会响应。如果耗时很长,可以不用等待响应。过一段时间后去查询索引信息确认即可。
修改分片数量
分片数量,必须在索引创建时指定,创建后无法修改。尝试修改时会报错:
请求
PUT test_index/_settings
{
"index" : {
"number_of_shards" : 3
}
}
响应
{
"error" : {
"root_cause" : [
{
"type" : "illegal_argument_exception",
"reason" : "Can't update non dynamic settings [[index.number_of_shards]] for open indices [[test_index/b3GPz-gCRgmdpgcgEELY2A]]"
}
],
"type" : "illegal_argument_exception",
"reason" : "Can't update non dynamic settings [[index.number_of_shards]] for open indices [[test_index/b3GPz-gCRgmdpgcgEELY2A]]"
},
"status" : 400
}
创建索引时指定分片数量、副本数量
删除之前创建的索引:
DELETE test_index
重新创建 test_index索引:
PUT test_index
{
"settings" : {
"index" : {
"number_of_shards" : 3,
"number_of_replicas" : 1
}
}
}
响应:
{
"acknowledged" : true,
"shards_acknowledged" : true,
"index" : "test_index"
}
查看索引信息:
请求
GET test_index
响应
{
"test_index" : {
"aliases" : { },
"mappings" : { },
"settings" : {
"index" : {
"creation_date" : "1597456553836",
"number_of_shards" : "1",
"number_of_replicas" : "1",
"uuid" : "b3GPz-gCRgmdpgcgEELY2A",
"version" : {
"created" : "7080099"
},
"provided_name" : "test_index"
}
}
}
}
给索引设置别名
POST _aliases
{
"actions": [
{
"add": {
"index": "test_index",
"alias": "test_index_aliasname"
}
}
]
}
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