推特怎么改中文（推特怎么改成泰国趋势）
一、创建index，命名为twitter
PUT localhost:9200/twitter
{
"settings":{"number_of_shards":1}
}
设置shard分片数为1。
随后，也修改 number_of_replicas=0。
master 节点名称：_Yg0Q2v
二、为索引定义mapping 映射
根据Elasticsearch蕞佳实践，建议完成mapping设定后，再写入document数据。
{
"properties": {
"address": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore_above":256
}
}
},
"city": {
"type": "keyword"
},
"country": {
"type": "keyword"
},
"location": {
"type": "geo_point"
},
"province": {
"type": "keyword"
},
"uid": {
"type": "long"
},
"user": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore_above": 256
}
}
}
}
}
对于只需要做精确匹配的字段，应该设置为不做分词，这里通过type=keyword来设定。
通过 GET twitter/_mapping 验证一下创建完成的mapping映射。
地理位置数据类型：geo_point
地理位置，其值可以有如下四中表现形式：
object对象："location": {"lat": 41.12, "lon": -71.34}字符串："location": "41.12,-71.34"geohash："location": "drm3btev3e86"数组："location": [ -71.34, 41.12 ]三、创建具有显式映射的索引
也可以将创建index和mapping 合并在一步完成。
创建索引 twitter2 以及对应的mapping映射。
因为在本地localhost环境，特意设置number_of_shards=1和number_of_replicas=0，生产环境根据实际情况进行设置。
PUT twitter2/
{
"settings":{
"number_of_shards": 1,
"number_of_replicas": 0
},
"mappings": {
"_doc" : {
"properties": {
"address": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore_above":256
}
}
},
"city": {
"type": "keyword"
},
"country": {
"type": "keyword"
},
"location": {
"type": "geo_point"
},
"province": {
"type": "keyword"
},
"uid": {
"type": "long"
},
"user": {
"type": "text",
"fields": {
"keyword": {
"type": "keyword",
"ignore_above": 256
}
}
}
}
}
}
}
上述脚本在Elasticsearch 6.4.3 环境执行成功。
执行返回结果：
{
"acknowledged": true,
"shards_acknowledged": true,
"index": "twitter2"
}
如果在Elasticsearch 7.3.0 环境中，去除"_doc" 节点，可以实现相同的效果，同时创建好索引twitter2和对应的mapping。
在Elasticsearch 7.3.0环境中，执行完成，返回结果。
{
"acknowledged" : true,
"shards_acknowledged" : true,
"index" : "twitter2"
}
如下是创建具有显式映射的索引在Elasticsearch 6.* 和 7.* 版本的官方文档。其中差异部分，进行了标识，主要在7.* 版本中，已经移除了type类型。
四、插入document 数据
单条doc插入；
POST twitter/_doc/1
{
"user":"good man",
"uid":1,
"city": "武汉",
"province": "湖北",
"country": "中国",
"location": {
"lat": "29",
"lon": "221"
}
}
批量操作 bulk
POST _bulk
{"index": {"_index": "twitter", "_type":"_doc"}}
{"user":"rickie", "uid": 2, "city":"shanghai", "province":"shanghai","country":"China", "address":"No. 1801", "location":{"lat":"21", "lon":"100"}}
{"index": {"_index": "twitter", "_type":"_doc"}}
{"user":"abc", "message":"hello world", "uid": 3,"age":20, "city":"上海", "province":"shanghai","country":"中国", "address":"#1801", "location":{"lat":"21", "lon":"100"}}
{"index": {"_index": "twitter", "_type":"_doc"}}
{"user":"康小姐", "message":"hello world", "uid": 4,"age":20, "city":"北京", "province":"北京","country":"China", "address":"#1801", "location":{"lat":"21", "lon":"100"}}
{"index": {"_index": "twitter", "_type":"_doc"}}
{"user":"tom", "message":"hello tom", "uid": 5,"age":36, "city":"shanghai", "province":"shanghai","country":"China", "address":"#1801", "location":{"lat":"21", "lon":"100"}}
{"index": {"_index": "twitter", "_type":"_doc"}}
{"user":"Jacky", "message":"hello Jacky", "uid": 6,"age":40, "city":"shanghai", "province":"shanghai","country":"China", "address":"#1801", "location":{"lat":"21", "lon":"100"}}
document 插入完成之后，确认一下。
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