ES 增加慢查询日志

方法一，在集群配置文件添加，需重启
配置文件添加

index.search.slowlog.threshold.query.warn: 10s  #超过10秒的query产生1个warn日志
index.search.slowlog.threshold.query.info: 5s  #超过5秒的query产生1个info日志
index.search.slowlog.threshold.query.debug: 2s #超过2秒的query产生1个debug日志
index.search.slowlog.threshold.query.trace: 500ms #超过500毫秒的query产生1个trace日志

index.search.slowlog.threshold.fetch.warn: 1s  ##fetch阶段的配置
index.search.slowlog.threshold.fetch.info: 800ms
index.search.slowlog.threshold.fetch.debug: 500ms
index.search.slowlog.threshold.fetch.trace: 200ms

index.indexing.slowlog.threshold.index.warn: 10s   ##索引数据超过10秒产生一个warn日志
index.indexing.slowlog.threshold.index.info: 5s  ##索引数据超过5秒产生一个info日志
index.indexing.slowlog.threshold.index.debug: 2s ##索引数据超过2秒产生一个ddebug日志
index.indexing.slowlog.threshold.index.trace: 500ms ##索引数据超过500毫秒产生一个trace日志

针对所有索引生效

PUT /_all/_settings
{
    "index.search.slowlog.threshold.query.warn":"5s",
    "index.search.slowlog.threshold.query.info":"2s",
    "index.search.slowlog.threshold.query.debug":"1s",
    "index.search.slowlog.threshold.query.trace":"400ms",
    "index.search.slowlog.threshold.fetch.warn":"1s",
    "index.search.slowlog.threshold.fetch.info":"800ms",
    "index.search.slowlog.threshold.fetch.debug":"500ms",
    "index.search.slowlog.threshold.fetch.trace":"200ms",
    "index.indexing.slowlog.threshold.index.warn":"5s",
    "index.indexing.slowlog.threshold.index.info":"2s",
    "index.indexing.slowlog.threshold.index.debug":"1s",
    "index.indexing.slowlog.threshold.index.trace":"400ms"
}

针对单个索引生效

PUT /my_index/_settings
{
    "index.search.slowlog.threshold.query.warn" : "10s", 
    "index.search.slowlog.threshold.fetch.debug": "500ms", 
    "index.indexing.slowlog.threshold.index.info": "5s" 
}

查询慢于 10 秒输出一个 WARN 日志。
获取慢于 500 毫秒输出一个 DEBUG 日志。
索引慢于 5 秒输出一个 INFO 日志。