elasticsearch 分词器配置注意事项

//插件代码
package org.elasticsearch.index.analysis;

public class MMsegAnalysisBinderProcessor extends AnalysisModule.AnalysisBinderProcessor
{
  public void processAnalyzers(AnalysisModule.AnalysisBinderProcessor.AnalyzersBindings analyzersBindings)
  {
   //以名字为mmesg为分析器的名字注入到es容器中
    analyzersBindings.processAnalyzer("mmseg", MMsegAnalyzerProvider.class);
    super.processAnalyzers(analyzersBindings);
  }

  public void processTokenizers(AnalysisModule.AnalysisBinderProcessor.TokenizersBindings tokenizersBindings)
  {
     


    //以名字为mmesg为分词器的名字注入到es容器中
    tokenizersBindings.processTokenizer("mmseg", MMsegTokenizerFactory.class);

    super.processTokenizers(tokenizersBindings);
  }

  public void processTokenFilters(AnalysisModule.AnalysisBinderProcessor.TokenFiltersBindings tokenFiltersBindings)
  {
    tokenFiltersBindings.processTokenFilter("cut_letter_digit", CutLetterDigitTokenFilter.class);
    super.processTokenFilters(tokenFiltersBindings);
  }
}

//装配Tokenizers
 public static class TokenizersBindings {
            //TokenizersMap
            private final Map<String, Class<? extends TokenizerFactory>> tokenizers = Maps.newHashMap();

            public TokenizersBindings() {
            }

            public void processTokenizer(String name, Class<? extends TokenizerFactory> tokenizerFactory) {
                tokenizers.put(name, tokenizerFactory);
            }
        }

        public void processAnalyzers(AnalyzersBindings analyzersBindings) {

        }

        //构建Analyzers
        public static class AnalyzersBindings {
            //AnalyzersMap
           private final Map<String, Class<? extends AnalyzerProvider>> analyzers = Maps.newHashMap();

            public AnalyzersBindings() {
            }

            public void processAnalyzer(String name, Class<? extends AnalyzerProvider> analyzerProvider) {
                analyzers.put(name, analyzerProvider);
            }

        }  

   所以配置文件中index.analysis.analyzer.default.type : "mmseg"

   这样就可以指定默认分析器了。

   注意：

   如果配置文件中这样配置了

index:
  analysis: 
    tokenizer:
      mmseg_maxword:
        type: mmseg
        seg_type: max_word
      mmseg_complex:
        type: mmseg
        seg_type: complex
    analyzer:
      mmseg_maxword:
        type: custom
        filter:
        - lowercase
        - cut_letter_digit
        tokenizer: mmseg_maxword
      mmseg:
        type: custom
        filter:
        - lowercase
        - cut_letter_digit
        tokenizer: mmseg_maxword
      mmseg_complex:
        type: custom
        filter:
        - lowercase
        - cut_letter_digit
        tokenizer: mmseg_complex
#index.analysis.analyzer.default.type : "org.elasticsearch.index.analysis.MMsegAnalyzerProvider"
#index.analysis.analyzer.default.type : "ik"
index.analysis.analyzer.default.type : "mmseg"

    这里也配置了一个：

mmseg:
        type: custom
        filter:
        - lowercase
        - cut_letter_digit
        tokenizer: mmseg_maxword


应该和插件中的名字重名了

访问：
http://localhost:9200/zzm/_analyze?analyzer=mmseg&text=中华人民共和国user123
这里调用的mmseg分析器是配置文件中配置的分析器

http://localhost:9200/zzm/_analyze?field=content&text=中华人民共和国user123
这里调用的是zzm索引content字段使用的分析器，这个分析器可以在mapping里面指定，如果不指定，用的就是默认的分析器index.analysis.analyzer.default.type : "mmseg"
这里的mmseg是插件注入的原生mmseg的分析器，而不是

mmseg:
        type: custom
        filter:
        - lowercase
        - cut_letter_digit
        tokenizer: mmseg_maxword







总结：elasticsearch.yml 中定义分析器和分词插件包中注入的分析器都同时注入到了elasticSearch容器当中。

1.mapping中定义的分析器，会根据名称mmseg_complex，去容器中找相应的分析器。
如果在mapping中不指定分析器，那么就使用elasticsearch.yml 配置文件中默认的分析器

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

NamedAnalyzer namedAnalyzer =new NamedAnalyzer("mmseg_complex", new MMSegAnalyzer());
rootObjectMapperBuilder..add(new StringFieldMapper.Builder("title").store(true) .index(true).tokenized(true) .indexAnalyzer(namedAnalyzer) .searchAnalyzer(namedAnalyzer)

2.http://localhost:9200/zzm/_analyze?analyzer=mmseg&text=中华人民共和国user123
这里的分析器mmseg，会根据名称从器容器里面找的分析器
2.1 如果找不到会提示：{"error":"ElasticsearchIllegalArgumentException[failed to find analyzer [mmseg2]]","status":400}
2.2 如果配置文件中定义名字为mmseg分析器，插件中也有一个名称为mmseg分析器，那么配置文件定义的分析器优先

3.http://localhost:9200/zzm/_analyze?field=content&text=中华人民共和国user123
这里是mapping中content字段定义的分析器来分词。
如果在mapping中不指定分析器，那么就使用elasticsearch.yml 配置文件中默认的分析器

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

4.index.analysis.analyzer.default.type : "mmseg"
es 会去插件中注入的容器中找mmseg分析器。如果没找到则会报错。
比如写成这样ndex.analysis.analyzer.default.type :  mmseg_maxword
报错：
Caused by: org.elasticsearch.ElasticsearchIllegalArgumentException: failed to find analyzer type [mmseg_maxword] or tokenizer for [default]
	at org.elasticsearch.index.analysis.AnalysisModule.configure(AnalysisModule.java:372)
	at org.elasticsearch.common.inject.AbstractModule.configure(AbstractModule.java:60)
	at org.elasticsearch.common.inject.spi.Elements$RecordingBinder.install(Elements.java:204)
	at org.elasticsearch.common.inject.spi.Elements.getElements(Elements.java:85)
	at org.elasticsearch.common.inject.InjectorShell$Builder.build(InjectorShell.java:130)
	at org.elasticsearch.common.inject.InjectorBuilder.build(InjectorBuilder.java:99)
	at org.elasticsearch.common.inject.InjectorImpl.createChildInjector(InjectorImpl.java:131)
	at org.elasticsearch.common.inject.ModulesBuilder.createChildInjector(ModulesBuilder.java:69)
	at org.elasticsearch.indices.IndicesService.createIndex(IndicesService.java:336)
	... 8 more
Caused by: org.elasticsearch.common.settings.NoClassSettingsException: Failed to load class setting [type] with value [mmseg_maxword]
	at org.elasticsearch.common.settings.ImmutableSettings.loadClass(ImmutableSettings.java:476)
	at org.elasticsearch.common.settings.ImmutableSettings.getAsClass(ImmutableSettings.java:464)
	at org.elasticsearch.index.analysis.AnalysisModule.configure(AnalysisModule.java:356)
	... 16 more
Caused by: java.lang.ClassNotFoundException: org.elasticsearch.index.analysis.mmsegmaxword.MmsegMaxwordAnalyzerProvider
	at java.net.URLClassLoader$1.run(URLClassLoader.java:366)
	at java.net.URLClassLoader$1.run(URLClassLoader.java:355)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.net.URLClassLoader.findClass(URLClassLoader.java:354)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:425)
	at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
	at java.lang.ClassLoader.loadClass(ClassLoader.java:358)
	at org.elasticsearch.common.settings.ImmutableSettings.loadClass(ImmutableSettings.java:474)

看下源码：

at org.elasticsearch.index.analysis.AnalysisModule.configure(AnalysisModule.java:372)

 Class<? extends AnalyzerProvider> type = null;
            try {
                 //index.analysis.analyzer.default.type : "mmseg"
                //根据配置默认的插件名称去找插件供应者，找不到则抛出异常
                type = analyzerSettings.getAsClass("type", null, "org.elasticsearch.index.analysis.", "AnalyzerProvider");
            } catch (NoClassSettingsException e) {
                // nothing found, see if its in bindings as a binding name
                if (analyzerSettings.get("type") != null) {
                    type = analyzersBindings.analyzers.get(Strings.toUnderscoreCase(analyzerSettings.get("type")));
                    if (type == null) {
                        type = analyzersBindings.analyzers.get(Strings.toCamelCase(analyzerSettings.get("type")));
                    }
                }
                if (type == null) {
                    // no specific type, check if it has a tokenizer associated with it
                    String tokenizerName = analyzerSettings.get("tokenizer");
                    if (tokenizerName != null) {
                        // we have a tokenizer, use the CustomAnalyzer
                        type = CustomAnalyzerProvider.class;
                    } else {
                        throw new ElasticsearchIllegalArgumentException("failed to find analyzer type [" + analyzerSettings.get("type") + "] or tokenizer for [" + analyzerName + "]", e);
                    }
                }
            }