有用 - 解决ElasticSearch的maximum shards open问题

# 解决ElasticSearch的maximum shards open问题

### 问题：

> ValidationException[Validation Failed: 1: this action would add [2] total shards, but this cluster currently has [999]/[1000] maximum shards open;] 

### 原因：

> 这是因为集群最大shard(分片)数不足引起的，从Elasticsearch v7.0 开始，集群中的每个节点默认限制1000个分片。 

### 解决：

#### 方案1、在elasticsearch.yml中定义

```bash
> cluster.max_shards_per_node: 10000 
```

#### 方案2、在kibana控制台执行：

```bash
PUT /_cluster/settings
{
  "transient": {
    "cluster": {
      "max_shards_per_node":10000
    }
  }
} 
```

#### 方案3、在linux控制台执行：

```bash
curl -XPUT http://localhost:9200/_cluster/settings \
-u elastic:password \
-H "Content-Type: application/json" \
-d '{"transient":{"cluster":{"max_shards_per_node":10000}}}' 
```

### 结果：

返回`{"acknowledged":true,"persistent":{},"transient":{"cluster":{"max_shards_per_node":"10000"}}}`表示执行成功！

## 查询

```bash
GET /_cluster/settings
```

返回

```json
{
  "persistent" : { },
  "transient" : {
    "cluster" : {
      "max_shards_per_node" : "10000"
    }
  }
}
```