项目场景：

springboot中使用ES7查询一个月内的数据量趋势时出错。在开发线上正常，演示线时出现异常

问题描述

项目在演示线环境的时候，出现查询异常

异常信息如下：

org.elasticsearch.ElasticsearchStatusException: Elasticsearch exception [type=circuit_breaking_exception, reason=[parent] Data too large, data for [] would be [31741946644/29.5gb], which is larger than the limit of [31621696716/29.4gb], real usage: [31741945664/29.5gb], new bytes reserved: [980/980b], usages [request=0/0b, fielddata=896932/875.9kb, in_flight_requests=980/980b, model_inference=0/0b, accounting=89070922/84.9mb]]
        at org.elasticsearch.rest.BytesRestResponse.errorFromXContent(BytesRestResponse.java:187)
        at org.elasticsearch.client.RestHighLevelClient.parseEntity(RestHighLevelClient.java:1911)
        at org.elasticsearch.client.RestHighLevelClient.parseResponseException(RestHighLevelClient.java:1888)
        at org.elasticsearch.client.RestHighLevelClient.internalPerformRequest(RestHighLevelClient.java:1645)
        at org.elasticsearch.client.RestHighLevelClient.performRequest(RestHighLevelClient.java:1602)
        at org.elasticsearch.client.RestHighLevelClient.performRequestAndParseEntity(RestHighLevelClient.java:1572)
        at org.elasticsearch.client.RestHighLevelClient.search(RestHighLevelClient.java:1088)

原因分析：

原因：ES默认的缓存设置是缓存区是只进不出的，一当缓存区不够时，就会抛出异常

解决方案：

1. API方式设置，无需重启ES

PUT _cluster/settings
 {
   "persistent" : {
     "indices.breaker.fielddata.limit" : "40%" 
   }
 }

2. 设置elasticsearch.yml文件，然后重启ES

indices.memory.index_buffer_size: 30%
indices.recovery.max_bytes_per_sec: 30mb
indices.fielddata.cache.size: 30%
indices.breaker.fielddata.limit: 40%
indices.breaker.request.limit: 40%
indices.breaker.total.use_real_memory: false
indices.breaker.total.limit: 70%

配置完后，重新查询，正常