使用es中遇到的问题

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1.安装head插件时，记性npm install时提示错误：This failure might be due to the use of legacy binary “node”
原因：可能是因为安装了node而不是nodejs导致，使用如下指令安装sudo apt-get install nodejs-legacy后重新进行npm install即可正常

2.安装grunt插件：
sudo npm install -g grunt-cli

3.head插件无法连上集群

vim $ES_HOME$/config/elasticsearch.yml# 增加如下字段http.cors.enabled: truehttp.cors.allow-origin: "*"

4.查询时显示：no [query] registered for [filtered]
查询语句：

{    "query" : {        "filtered" : {            "filter" : {                "range" : {                    "age" : { "gt" : 30 } <1>                }            },            "query" : {                "match" : {                    "last_name" : "Smith" <2>                }            }        }    }}

其中的filtered已经弃用，应该使用如下查询方法：

{  "query": {    "bool": {      "filter": {        "range": {          "age": {            "gt": 20          }        }      },      "must": {        "match": {          "last_name": "Smith"        }      }    }  }}

5.进行统计的时候使用如下语句报错：

{  "aggs": {    "all_interests": {      "terms": {        "field": "interests"      }    }  }}

报错："root_cause": [    {        "type": "illegal_argument_exception",        "reason": "Fielddata is disabled on text fields by default. Set fielddata=true on [interests] in order to load fielddata in memory by uninverting the inverted index. Note that this can however use significant memory."    }]

原因：
Fielddata can consume a lot of heap space, especially when loading high cardinality text fields. Once fielddata has been loaded into the heap, it remains there for the lifetime of the segment.
（fielddata会消耗大量的栈内存，尤其在进行加载文本的时候，所以一单fielddata完成了加载，就会一直存在。）
Also, loading fielddata is an expensive process which can cause users to experience latency hits. This is why fielddata is disabled by default.
（同时，加载fielddata的过程中可能造成延迟命中，所以fielddata默认是关闭的。）
参考如下Doc

解决方法：{  "aggs": {    "all_interests": {      "terms": {        "field": "interests.keyword"      }    }  }}

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