Java High Level REST Client 之创建索引

1. 创建索引请求

CreateIndexRequest request = new CreateIndexRequest("twitter");

2.设置

2.1 分别设置

2.1.1 索引设置

request.settings(Settings.builder() 
    .put("index.number_of_shards", 3)
    .put("index.number_of_replicas", 2)
);

2.1.2 映射表

request.mapping(
        "{
" +
        "  "properties": {
" +
        "    "message": {
" +
        "      "type": "text"
" +
        "    }
" +
        "  }
" +
        "}", 
        XContentType.JSON);

也可以用map：

Map<String, Object> message = new HashMap<>();
message.put("type", "text");
Map<String, Object> properties = new HashMap<>();
properties.put("message", message);
Map<String, Object> mapping = new HashMap<>();
mapping.put("properties", properties);
request.mapping(mapping);

或者XContentBuilder ：

XContentBuilder builder = XContentFactory.jsonBuilder();
builder.startObject();
{
    builder.startObject("properties");
    {
        builder.startObject("message");
        {
            builder.field("type", "text");
        }
        builder.endObject();
    }
    builder.endObject();
}
builder.endObject();
request.mapping(builder);

2.1.3 索引别名

request.alias(new Alias("twitter_alias").filter(QueryBuilders.termQuery("user", "kimchy")));

别名不仅仅可以关联一个索引，它能聚合多个索引。

例如我们为索引my_index_1 和 my_index_2 创建一个别名my_index_alias，这样对my_index_alias的操作(仅限读操作)，会操作my_index_1和my_index_2，类似于聚合了my_index_1和my_index_2.但是我们是不能对my_index_alias进行写操作，当有多个索引时alias，不能区分到底操作哪一个。

2.2 整体设置

request.source("{
" +
        "    "settings" : {
" +
        "        "number_of_shards" : 1,
" +
        "        "number_of_replicas" : 0
" +
        "    },
" +
        "    "mappings" : {
" +
        "        "properties" : {
" +
        "            "message" : { "type" : "text" }
" +
        "        }
" +
        "    },
" +
        "    "aliases" : {
" +
        "        "twitter_alias" : {}
" +
        "    }
" +
        "}", XContentType.JSON);

3.其他参数

超时（Timeout to wait for the all the nodes to acknowledge the index creation as a TimeValue）：

request.setTimeout(TimeValue.timeValueMinutes(2));

连接主节点超时（Timeout to connect to the master node as a TimeValue）：

request.setMasterTimeout(TimeValue.timeValueMinutes(1));

4.执行请求

4.1 同步执行

CreateIndexResponse createIndexResponse = client.indices().create(request, RequestOptions.DEFAULT);

4.2 异步执行

client.indices().createAsync(request, RequestOptions.DEFAULT, listener);

其中listener：

ActionListener<CreateIndexResponse> listener =
        new ActionListener<CreateIndexResponse>() {

    @Override
    public void onResponse(CreateIndexResponse createIndexResponse) {
        
    }

    @Override
    public void onFailure(Exception e) {
        
    }
};

5.响应

boolean acknowledged = createIndexResponse.isAcknowledged(); 
boolean shardsAcknowledged = createIndexResponse.isShardsAcknowledged();

Java High Level REST Client 之 创建索引