elasticsearch中文分词插件IK使用

ES支持中文的前提是安装正确的分词组件，比如elasticsearch-analysis-ik。
版本支持如下：

安装

# git clone https://github.com/medcl/elast ... k.git --depth 1
# cd elasticsearch-analysis-ik/
# mvn package
# unzip ./target/releases/elasticsearch-analysis-ik-1.2.9.zip

OR

# git clone https://github.com/medcl/elasticsearch-analysis-ik# cd elasticsearch-analysis-ik
# mvn compile
# mvn package
# plugin --install analysis-ik --url file:///#{project_path}/elasticsearch-analysis-ik/target/releases/elasticsearch-analysis-ik-1.3.0.zip

zip解压得到5个jar包：

1. - elasticsearch-analysis-ik-1.2.9.jar

2. - httpclient-4.3.5.jar

3. - httpcore-4.3.2.jar

4. - commons-logging-1.1.3.jar

5. - commons-codec-1.6.jar

返回ES目录，新建路径./plugins/analysis-ik并把上述jar包全部移进去。
第二步，把elasticsearch-analysis-ik/config/ik文件夹（IK自带的词典）复制到ES目录的./config路径下。
第三步，在./config/elasticsearch.yml文件的最后加上：

index:
  analysis:
    analyzer:
      ik:
          alias: [news_analyzer_ik,ik_analyzer]
          type: org.elasticsearch.index.analysis.IkAnalyzerProvider

index.analysis.analyzer.default.type : "ik"

OR

[b]index.analysis.analyzer.ik.type : "ik"[/b]

注意配置分词组件必须在创建索引之前，否则是无效的。

Example

1.create a index

# curl -XPUT http://localhost:9200/index

2.create a mapping

# curl -XPUT http://localhost:9200/indexcreate a mapping
curl -XPOST http://localhost:9200/index/fulltext/_mapping -d'
{
    "fulltext": {
             "_all": {
            "indexAnalyzer": "ik",
            "searchAnalyzer": "ik",
            "term_vector": "no",
            "store": "false"
        },
        "properties": {
            "content": {
                "type": "string",
                "store": "no",
                "term_vector": "with_positions_offsets",
                "indexAnalyzer": "ik",
                "searchAnalyzer": "ik",
                "include_in_all": "true",
                "boost": 8
            }
        }
    }
}'

3.index some docs

# curl -XPOST http://localhost:9200/index/fulltext/1 -d'
{"content":"美国留给伊拉克的是个烂摊子吗"}
'

# curl -XPOST http://localhost:9200/index/fulltext/2 -d'
{"content":"公安部：各地校车将享最高路权"}
'

# curl -XPOST http://localhost:9200/index/fulltext/3 -d'
{"content":"中韩渔警冲突调查：韩警平均每天扣1艘中国渔船"}
'

# curl -XPOST http://localhost:9200/index/fulltext/4 -d'
{"content":"中国驻洛杉矶领事馆遭亚裔男子枪击 嫌犯已自首"}
'

4.query with highlighting

# curl -XPOST http://localhost:9200/index/fulltext/_search  -d'
{
    "query" : { "term" : { "content" : "中国" }},
    "highlight" : {
        "pre_tags" : ["<tag1>", "<tag2>"],
        "post_tags" : ["</tag1>", "</tag2>"],
        "fields" : {
            "content" : {}
        }
    }
}
'

Result

{
    "took": 14,
    "timed_out": false,
    "_shards": {
        "total": 5,
        "successful": 5,
        "failed": 0
    },
    "hits": {
        "total": 2,
        "max_score": 2,
        "hits": [
            {
                "_index": "index",
                "_type": "fulltext",
                "_id": "4",
                "_score": 2,
                "_source": {
                    "content": "中国驻洛杉矶领事馆遭亚裔男子枪击 嫌犯已自首"
                },
                "highlight": {
                    "content": [
                        "<tag1>中国</tag1>驻洛杉矶领事馆遭亚裔男子枪击 嫌犯已自首 "
                    ]
                }
            },
            {
                "_index": "index",
                "_type": "fulltext",
                "_id": "3",
                "_score": 2,
                "_source": {
                    "content": "中韩渔警冲突调查：韩警平均每天扣1艘中国渔船"
                },
                "highlight": {
                    "content": [
                        "均每天扣1艘<tag1>中国</tag1>渔船 "
                    ]
                }
            }
        ]
    }
}