Elasticsearch采坑实践总结

爱被打了一巴掌 2023-06-23 15:29 103阅读 0赞

## **【1】java.lang.AbstractMethodError** ##

**异常如下：**

org.elasticsearch.transport.TcpTransport.connectToChannels(Lorg/elasticsearch/cluster/node/DiscoveryNode;Lorg/elasticsearch/transport/ConnectionProfile;)Lorg/elasticsearch/transport/TcpTransport$NodeChannels;

**这种类似错误，通常是由于版本问题造成的**。这里es版本是5.2.2，自动引入的netty版本是5.6.8，那么降低transport-netty4-client版本与elasticsearch保持一致即可。  
![在这里插入图片描述][20191220113359728.png]  
**pom如下：**

<dependency>
                <groupId>org.elasticsearch</groupId>
                <artifactId>elasticsearch</artifactId>
                <version>5.2.2</version>
            </dependency>
            
            <dependency>
                <groupId>org.elasticsearch.client</groupId>
                <artifactId>transport</artifactId>
                <version>5.2.2</version>
                <exclusions>
                    <exclusion>
                        <artifactId>transport-netty4-client</artifactId>
                        <groupId>org.elasticsearch.plugin</groupId>
                    </exclusion>
                </exclusions>
            </dependency>
    
            <dependency>
                <groupId>org.elasticsearch.plugin</groupId>
                <artifactId>transport-netty4-client</artifactId>
                <version>5.2.2</version>
            </dependency>

--------------------

## **【2】 java.lang.IllegalArgumentException：Can only use fuzzy queries on keyword and text fields - not on \[createDate\] which is of type \[date\]** ##

**异常实例：**

Caused by: java.lang.IllegalArgumentException: Can only use fuzzy queries on keyword and text fields - not on [createDate] which is of type [date]
    	at org.elasticsearch.index.mapper.MappedFieldType.fuzzyQuery(MappedFieldType.java:354)
    	at org.elasticsearch.index.query.FuzzyQueryBuilder.doToQuery(FuzzyQueryBuilder.java:341)
    	at org.elasticsearch.index.query.AbstractQueryBuilder.toQuery(AbstractQueryBuilder.java:97)
    	at org.elasticsearch.index.query.QueryShardContext.lambda$toQuery$1(QueryShardContext.java:312)
    	at org.elasticsearch.index.query.QueryShardContext.toQuery(QueryShardContext.java:329)
    	... 14 more

**原因分析**

模糊查询不能适用于`type==date 的字段，只能使用于type==keyword|text`。

--------------------

## **【3】java.lang.IllegalArgumentException: Unable to identify index name. Person is not a Document. Make sure the document class is annotated with @Document(indexName=“foo”)** ##

**异常实例如下：**

java.lang.IllegalArgumentException: Unable to identify index name. Person is not a Document. Make sure the document class is annotated with @Document(indexName="foo")
    	at org.springframework.util.Assert.isTrue(Assert.java:118) ~[spring-core-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    	at org.springframework.data.elasticsearch.core.ElasticsearchRestTemplate.getPersistentEntityFor(ElasticsearchRestTemplate.java:1527) ~[spring-data-elasticsearch-3.2.3.RELEASE.jar:3.2.3.RELEASE]
    	at bleHandlerMethod.java:138) ~[spring-web-5.2.0.RELEASE.jar:5.2.0.RELEASE]
    //...

**背景原因分析：**

@PostMapping("/person")
        public String save(@RequestBody Person person) {
    
            IndexQuery indexQuery = new IndexQueryBuilder()
                    .withId(person.getId().toString())
                    .withObject(person)
                    .build();
            String documentId = elasticsearchOperations.index(indexQuery);
            return documentId;
        }

代码中直接用ES操作对象，那么需要对对象添加注解进行映射，[Object Mapping][]，可以点击参考该文档。

**解决方案**

给Person添加映射注解，如下所示：

@Document(indexName = "person",type = "person")
    public class Person {
    
        @Id
        private Integer id;
        @Field
        private String name;
        //...
    }

[20191220113359728.png]: https://img-blog.csdnimg.cn/20191220113359728.png
[Object Mapping]: https://blog.csdn.net/J080624/article/details/103683496