ElasticSearch 集群安装，简单使用

http://www.elastic.co/guide/en/elasticsearch/reference/current/setup-configuration.html
https://github.com/elastic/elasticsearch
###【在多台机器上执行下面的命令】###
#es启动时需要使用非root用户，所有创建一个xiaoniu用户：
useradd xiaoniu
#为hadoop用户添加密码：
echo  | passwd --stdin xiaoniu
#将bigdata添加到sudoers
echo "xiaoniu ALL = (root) NOPASSWD:ALL" | tee /etc/sudoers.d/xiaoniu
chmod  /etc/sudoers.d/xiaoniu
#解决sudo: sorry, you must have a tty to run sudo问题，在/etc/sudoer注释掉 Default requiretty 一行
sudo sed -i 's/Defaults    requiretty/Defaults:xiaoniu !requiretty/' /etc/sudoers

#创建一个bigdata目录
mkdir /{bigdata,data}
#给相应的目录添加权限
chown -R xiaoniu:xiaoniu /{bigdata,data}

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.安装jdk（jdk要求1..20以上）

.上传es安装包

.解压es
tar -zxvf elasticsearch-5.4..tar.gz -C /bigdata/

.修改配置
vi /bigdata/elasticsearch-5.4./config/elasticsearch.yml
#集群名称，通过组播的方式通信，通过名称判断属于哪个集群
cluster.name: bigdata
#节点名称，要唯一
node.name: es-
#数据存放位置
path.data: /data/es/data
#日志存放位置(可选)
path.logs: /data/es/logs
#es绑定的ip地址
network.host: 192.168.10.16
#初始化时可进行选举的节点
discovery.zen.ping.unicast.hosts: ["node-4", "node-5", "node-6"]

/bigdata/elasticsearch-5.4./bin/elasticsearch -d
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#出现错误
[]: max file descriptors [] for elasticsearch process is too low, increase to at least []
[]: max virtual memory areas vm.max_map_count [] is too low, increase to at least []

#用户最大可创建文件数太小
sudo vi /etc/security/limits.conf
* soft nofile
* hard nofile 

#查看可打开文件数量
ulimit -Hn

#最大虚拟内存太小
sudo vi /etc/sysctl.conf
vm.max_map_count=

#查看虚拟内存的大小
sudo sysctl -p

.使用scp拷贝到其他节点
scp -r elasticsearch-5.4./ node-:$PWD
scp -r elasticsearch-5.4./ node-:$PWD

.在其他节点上修改es配置，需要修改的有node.name和network.host

.启动es（/bigdata/elasticsearch-5.4./bin/elasticsearch -h查看帮助文档）
/bigdata/elasticsearch-5.4./bin/elasticsearch -d

.用浏览器访问es所在机器的9200端口
http://192.168.10.16:9200/
{
  "name" : "node-2",
  "cluster_name" : "bigdata",
  "cluster_uuid" : "v4AHbENYQ8-M3Aq8J5OZ5g",
  "version" : {
    "number" : "5.4.3",
    "build_hash" : "eed30a8",
    "build_date" : "2017-06-22T00:34:03.743Z",
    "build_snapshot" : false,
    "lucene_version" : "6.5.1"
  },
  "tagline" : "You Know, for Search"
}

kill `ps -ef | grep Elasticsearch | grep -v grep | awk '{print $2}'`

#查看集群状态
curl -XGET 'http://192.168.10.16:9200/_cluster/health?pretty'
http://192.168.10.16:9200/_cluster/health?pretty
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RESTful接口URL的格式：
http://192.168.10.16:9200/<index>/<type>/[<id>]
其中index、type是必须提供的。
id是可选的，不提供es会自动生成。
index、type将信息进行分层，利于管理。
index可以理解为数据库；type理解为数据表；id相当于数据库表中记录的主键，是唯一的。

#向store索引中添加一些书籍
curl -XPUT 'http://192.168.10.16:9200/store/books/1' -d '{
  "title": "Elasticsearch: The Definitive Guide",
  "name" : {
    "first" : "Zachary",
    "last" : "Tong"
  },
  "publish_date":"2015-02-06",
  "price":"49.99"
}'

#在linux中通过curl的方式查询
curl -XGET 'http://192.168.10.18:9200/store/books/1'

#通过浏览器查询
http://192.168.10.18:9200/store/books/1

#在添加一个书的信息
curl -XPUT 'http://192.168.10.18:9200/store/books/2' -d '{
  "title": "Elasticsearch Blueprints",
  "name" : {
    "first" : "Vineeth",
    "last" : "Mohan"
  },
  "publish_date":"2015-06-06",
  "price":"35.99"
}'

# 通过ID获得文档信息
curl -XGET 'http://192.168.10.18:9200/store/books/1'

#在浏览器中查看
http://92.168.10.18:9200/store/books/1

# 通过_source获取指定的字段
curl -XGET 'http://192.168.10.16:9200/store/books/1?_source=title'
curl -XGET 'http://192.168.10.16:9200/store/books/1?_source=title,price'
curl -XGET 'http://192.168.10.16:9200/store/books/1?_source'

#可以通过覆盖的方式更新
curl -XPUT 'http://192.168.10.16:9200/store/books/1' -d '{
  "title": "Elasticsearch: The Definitive Guide",
  "name" : {
    "first" : "Zachary",
    "last" : "Tong"
  },
  "publish_date":"2016-02-06",
  "price":"99.99"
}'

# 或者通过 _update  API的方式单独更新你想要更新的
curl -XPOST 'http://192.168.10.16:9200/store/books/1/_update' -d '{
  "doc": {
     "price" : 88.88
  }
}'

curl -XGET 'http://192.168.10.16:9200/store/books/1'

#删除一个文档
curl -XDELETE 'http://192.168.10.16:9200/store/books/1'

curl -XPUT 'http://192.168.10.16:9200/store/books/4' -d '{
  "title": "Elasticsearch: The Definitive Guide",
  "author": "Guide",
  "publish_date":"2016-02-06",
  "price":"35.99"
}'

#https://www.elastic.co/guide/en/elasticsearch/reference/current/query-dsl.html
# 最简单filter查询
# SELECT * FROM books WHERE price = 35.99
# filtered 查询价格是35.99的
# 返回的的分是1.
curl -XGET 'http://192.168.10.16:9200/store/books/_search' -d '{
  "query": {
    "bool": {
      "must": {
        "match_all": {}
      },
      "filter": {
        "term": {
          "price": 35.99
        }
      }
    }
  }
}'

# 返回的的分是1.
curl -XGET 'http://192.168.10.16:9200/store/books/_search' -d '{
  "query": {
    "constant_score": {
      "filter": {
        "term": {
          "price": 35.99
        }
      }
    }
  }
}'

# 返回的的分是0.
curl -XGET 'http://192.168.10.16:9200/store/books/_search' -d '{
    "query": {
        "bool": {
           "filter" : {
                "term" : {
                  "price" : 35.99
                }
            }
        }
    }
}'

#指定多个值
curl -XGET 'http://192.168.10.16:9200/store/books/_search' -d '{
    "query" : {
        "bool" : {
            "filter" : {
                "terms" : {
                    "price" : [35.99, 99.99]
                  }
              }
        }
    }
}'

curl -XGET 'http://192.168.10.16:9200/store/books/_search' -d '{
    "query" : {
        "bool" : {
            "must": {
                "match_all": {}
            },
            "filter" : {
                "terms" : {
                    "price" : [35.99, 99.99]
                  }
              }
        }
    }
}'

# SELECT * FROM books WHERE publish_date = "2015-02-06"
curl -XGET 'http://192.168.10.16:9200/store/books/_search' -d '{
  "query" : {
    "bool" : {
        "filter" : {
           "term" : {
              "publish_date" : "2015-02-06"
            }
          }
      }
  }
}'

# bool过滤查询，可以做组合过滤查询
# SELECT * FROM books WHERE (price = 35.99 OR price = 99.99) AND publish_date != "2016-02-06"
# 类似的，Elasticsearch也有 and, or, not这样的组合条件的查询方式
# 格式如下：
#  {
#    "bool" : {
#    "must" :     [],
#    "should" :   [],
#    "must_not" : [],
#    }
#  }
#
# must: 条件必须满足，相当于 and
# should: 条件可以满足也可以不满足，相当于 or
# must_not: 条件不需要满足，相当于 not

curl -XGET 'http://192.168.10.16:9200/store/books/_search' -d '{
  "query" : {
    "bool" : {
      "should" : [
        { "term" : {"price" : 35.99}},
        { "term" : {"price" : 99.99}}
      ],
      "must_not" : {
        "term" : {"publish_date" : "2016-02-06"}
      }
    }
  }
}'

# 嵌套查询
# SELECT * FROM books WHERE price = 35.99 OR ( publish_date = "2016-02-06" AND price = 99.99 )

curl -XGET 'http://192.168.10.16:9200/store/books/_search' -d '{
    "query": {
        "bool": {
            "should": [
                {
                    "term": {
                        "price": 35.99
                    }
                },
                {
                    "bool": {
                        "must": [
                            {
                                "term": {
                                    "publish_date": "2016-02-06"
                                }
                            },
                            {
                                "term": {
                                    "price": 99.99
                                }
                            }
                        ]
                    }
                }
            ]
        }
    }
}'

# range范围过滤
# SELECT * FROM books WHERE price >=  AND price <
# gt :  > 大于
# lt :  < 小于
# gte :  >= 大于等于
# lte :  <= 小于等于

curl -XGET 'http://192.168.10.16:9200/store/books/_search' -d '{
    "query": {
        "range" : {
            "price" : {
                "gte" : ,
                "lt" :
            }
        }
    }
}

#name和author都必须包含Guide，并且价钱等于33.99或者188.
curl -XGET 'http://192.168.10.16:9200/store/books/_search' -d '{
    "query": {
        "bool": {
            "must": {
                "multi_match": {
                    "operator": "and",
                    "fields": [
                        "name",
                        "author"
                    ],
                    "query": "Guide"
                }
            },
            "filter": {
                "terms": {
                    "price": [
                        35.99,
                        188.99
                    ]
                }
            }
        }
    }
}'

http://192.168.10.16:9200/store/books/_search