RestHighLevelClient操作ES的API
Create Index API
RestHighLevelClient client = new RestHighLevelClient( RestClient.builder( new HttpHost("localhost", 9200, "http"), new HttpHost("localhost", 9201, "http"))); CreateIndexRequest request = new CreateIndexRequest("twitter_two");//创建索引 //创建的每个索引都可以有与之关联的特定设置。 request.settings(Settings.builder() .put("index.number_of_shards", 3) .put("index.number_of_replicas", 2) ); //创建索引时创建文档类型映射 request.mapping("tweet",//类型定义 " {\n" + " \"tweet\": {\n" + " \"properties\": {\n" + " \"message\": {\n" + " \"type\": \"text\"\n" + " }\n" + " }\n" + " }\n" + " }",//类型映射,需要的是一个JSON字符串 XContentType.JSON); //为索引设置一个别名 request.alias( new Alias("twitter_alias") ); //可选参数 request.timeout(TimeValue.timeValueMinutes(2));//超时,等待所有节点被确认(使用TimeValue方式) //request.timeout("2m");//超时,等待所有节点被确认(使用字符串方式) request.masterNodeTimeout(TimeValue.timeValueMinutes(1));//连接master节点的超时时间(使用TimeValue方式) //request.masterNodeTimeout("1m");//连接master节点的超时时间(使用字符串方式) request.waitForActiveShards(2);//在创建索引API返回响应之前等待的活动分片副本的数量,以int形式表示。 //request.waitForActiveShards(ActiveShardCount.DEFAULT);//在创建索引API返回响应之前等待的活动分片副本的数量,以ActiveShardCount形式表示。 //同步执行 CreateIndexResponse createIndexResponse = client.indices().create(request); //异步执行 //异步执行创建索引请求需要将CreateIndexRequest实例和ActionListener实例传递给异步方法: //CreateIndexResponse的典型监听器如下所示: //异步方法不会阻塞并立即返回。 ActionListener<CreateIndexResponse> listener = new ActionListener<CreateIndexResponse>() { @Override public void onResponse(CreateIndexResponse createIndexResponse) { //如果执行成功,则调用onResponse方法; } @Override public void onFailure(Exception e) { //如果失败,则调用onFailure方法。 } }; client.indices().createAsync(request, listener);//要执行的CreateIndexRequest和执行完成时要使用的ActionListener //返回的CreateIndexResponse允许检索有关执行的操作的信息,如下所示: boolean acknowledged = createIndexResponse.isAcknowledged();//指示是否所有节点都已确认请求 boolean shardsAcknowledged = createIndexResponse.isShardsAcknowledged();//指示是否在超时之前为索引中的每个分片启动了必需的分片副本数
Delete Index API
RestHighLevelClient client = new RestHighLevelClient( RestClient.builder( new HttpHost("localhost", 9200, "http"), new HttpHost("localhost", 9201, "http"))); DeleteIndexRequest request = new DeleteIndexRequest("twitter_two");//指定要删除的索引名称 //可选参数: request.timeout(TimeValue.timeValueMinutes(2)); //设置超时,等待所有节点确认索引删除(使用TimeValue形式) // request.timeout("2m"); //设置超时,等待所有节点确认索引删除(使用字符串形式) request.masterNodeTimeout(TimeValue.timeValueMinutes(1));连接master节点的超时时间(使用TimeValue方式) // request.masterNodeTimeout("1m");//连接master节点的超时时间(使用字符串方式) //设置IndicesOptions控制如何解决不可用的索引以及如何扩展通配符表达式 request.indicesOptions(IndicesOptions.lenientExpandOpen()); //同步执行 DeleteIndexResponse deleteIndexResponse = client.indices().delete(request); /* //异步执行删除索引请求需要将DeleteIndexRequest实例和ActionListener实例传递给异步方法: //DeleteIndexResponse的典型监听器如下所示: //异步方法不会阻塞并立即返回。 ActionListener<DeleteIndexResponse> listener = new ActionListener<DeleteIndexResponse>() { @Override public void onResponse(DeleteIndexResponse deleteIndexResponse) { //如果执行成功,则调用onResponse方法; } @Override public void onFailure(Exception e) { //如果失败,则调用onFailure方法。 } }; client.indices().deleteAsync(request, listener);*/ //Delete Index Response //返回的DeleteIndexResponse允许检索有关执行的操作的信息,如下所示: boolean acknowledged = deleteIndexResponse.isAcknowledged();//是否所有节点都已确认请求 //如果找不到索引,则会抛出ElasticsearchException: try { request = new DeleteIndexRequest("does_not_exist"); client.indices().delete(request); } catch (ElasticsearchException exception) { if (exception.status() == RestStatus.NOT_FOUND) { //如果没有找到要删除的索引,要执行某些操作 } }
Open Index API
RestHighLevelClient client = new RestHighLevelClient( RestClient.builder( new HttpHost("localhost", 9200, "http"), new HttpHost("localhost", 9201, "http"))); OpenIndexRequest request = new OpenIndexRequest("twitter");//打开索引 //可选参数: request.timeout(TimeValue.timeValueMinutes(2)); //设置超时,等待所有节点确认索引已打开(使用TimeValue形式) // request.timeout("2m"); //设置超时,等待所有节点确认索引已打开(使用字符串形式) request.masterNodeTimeout(TimeValue.timeValueMinutes(1));连接master节点的超时时间(使用TimeValue方式) // request.masterNodeTimeout("1m");//连接master节点的超时时间(使用字符串方式) request.waitForActiveShards(2);//在打开索引API返回响应之前等待的活动分片副本的数量,以int形式表示。 //request.waitForActiveShards(ActiveShardCount.ONE);//在打开索引API返回响应之前等待的活动分片副本的数量,以ActiveShardCount形式表示。 //设置IndicesOptions控制如何解决不可用的索引以及如何扩展通配符表达式 request.indicesOptions(IndicesOptions.strictExpandOpen()); //同步执行 OpenIndexResponse openIndexResponse = client.indices().open(request); /*//异步执行打开索引请求需要将OpenIndexRequest实例和ActionListener实例传递给异步方法: //OpenIndexResponse的典型监听器如下所示: //异步方法不会阻塞并立即返回。 ActionListener<OpenIndexResponse> listener = new ActionListener<OpenIndexResponse>() { @Override public void onResponse(OpenIndexResponse openIndexResponse) { //如果执行成功,则调用onResponse方法; } @Override public void onFailure(Exception e) { //如果失败,则调用onFailure方法。 } }; client.indices().openAsync(request, listener);*/ //Open Index Response //返回的OpenIndexResponse允许检索有关执行的操作的信息,如下所示: boolean acknowledged = openIndexResponse.isAcknowledged();//指示是否所有节点都已确认请求 boolean shardsAcknowledged = openIndexResponse.isShardsAcknowledged();//指示是否在超时之前为索引中的每个分片启动了必需的分片副本数
Close Index API
RestHighLevelClient client = new RestHighLevelClient( RestClient.builder( new HttpHost("localhost", 9200, "http"), new HttpHost("localhost", 9201, "http"))); CloseIndexRequest request = new CloseIndexRequest("index");//关闭索引 //可选参数: request.timeout(TimeValue.timeValueMinutes(2)); //设置超时,等待所有节点确认索引已关闭(使用TimeValue形式) // request.timeout("2m"); //设置超时,等待所有节点确认索引已关闭(使用字符串形式) request.masterNodeTimeout(TimeValue.timeValueMinutes(1));连接master节点的超时时间(使用TimeValue方式) // request.masterNodeTimeout("1m");//连接master节点的超时时间(使用字符串方式) //设置IndicesOptions控制如何解决不可用的索引以及如何扩展通配符表达式 request.indicesOptions(IndicesOptions.lenientExpandOpen()); //同步执行 CloseIndexResponse closeIndexResponse = client.indices().close(request); /*//异步执行打开索引请求需要将CloseIndexRequest实例和ActionListener实例传递给异步方法: //CloseIndexResponse的典型监听器如下所示: //异步方法不会阻塞并立即返回。 ActionListener<CloseIndexResponse> listener = new ActionListener<CloseIndexResponse>() { @Override public void onResponse(CloseIndexResponse closeIndexResponse) { //如果执行成功,则调用onResponse方法; } @Override public void onFailure(Exception e) { //如果失败,则调用onFailure方法。 } }; client.indices().closeAsync(request, listener); */ //Close Index Response //返回的CloseIndexResponse 允许检索有关执行的操作的信息,如下所示: boolean acknowledged = closeIndexResponse.isAcknowledged(); //指示是否所有节点都已确认请求
Single document APIs
Index API
RestHighLevelClient client = new RestHighLevelClient( RestClient.builder( new HttpHost("localhost", 9200, "http"), new HttpHost("localhost", 9201, "http"))); IndexRequest indexRequest1 = new IndexRequest( "posts",//索引名称 "doc",//类型名称 "1");//文档ID //==============================提供文档源======================================== //方式1:以字符串形式提供 String jsonString = "{" + "\"user\":\"kimchy\"," + "\"postDate\":\"2013-01-30\"," + "\"message\":\"trying out Elasticsearch\"" + "}"; indexRequest1.source(jsonString, XContentType.JSON); //方式2:以Map形式提供 Map<String, Object> jsonMap = new HashMap<>(); jsonMap.put("user", "kimchy"); jsonMap.put("postDate", new Date()); jsonMap.put("message", "trying out Elasticsearch"); //Map会自动转换为JSON格式的文档源 IndexRequest indexRequest2 = new IndexRequest("posts", "doc", "1") .source(jsonMap); // 方式3:文档源以XContentBuilder对象的形式提供,Elasticsearch内部会帮我们生成JSON内容 XContentBuilder builder = XContentFactory.jsonBuilder(); builder.startObject(); { builder.field("user", "kimchy"); builder.field("postDate", new Date()); builder.field("message", "trying out Elasticsearch"); } builder.endObject(); IndexRequest indexRequest3 = new IndexRequest("posts", "doc", "1") .source(builder); //方式4:以Object key-pairs提供的文档源,它会被转换为JSON格式 IndexRequest indexRequest4 = new IndexRequest("posts", "doc", "1") .source("user", "kimchy", "postDate", new Date(), "message", "trying out Elasticsearch"); //===============================可选参数start==================================== indexRequest1.routing("routing");//设置路由值 indexRequest1.parent("parent");//设置parent值 //设置超时:等待主分片变得可用的时间 indexRequest1.timeout(TimeValue.timeValueSeconds(1));//TimeValue方式 indexRequest1.timeout("1s");//字符串方式 //刷新策略 indexRequest1.setRefreshPolicy(WriteRequest.RefreshPolicy.WAIT_UNTIL);//WriteRequest.RefreshPolicy实例方式 indexRequest1.setRefreshPolicy("wait_for");//字符串方式 indexRequest1.version(2);//设置版本 indexRequest1.versionType(VersionType.EXTERNAL);//设置版本类型 //操作类型 indexRequest1.opType(DocWriteRequest.OpType.CREATE);//DocWriteRequest.OpType方式 indexRequest1.opType("create");//字符串方式, 可以是 create 或 update (默认) //The name of the ingest pipeline to be executed before indexing the document indexRequest1.setPipeline("pipeline"); //===============================执行==================================== //同步执行 IndexResponse indexResponse = client.index(indexRequest1); //异步执行 //IndexResponse 的典型监听器如下所示: //异步方法不会阻塞并立即返回。 ActionListener<IndexResponse> listener = new ActionListener<IndexResponse>() { @Override public void onResponse(IndexResponse indexResponse) { //执行成功时调用。 Response以参数方式提供 } @Override public void onFailure(Exception e) { //在失败的情况下调用。 引发的异常以参数方式提供 } }; //异步执行索引请求需要将IndexRequest实例和ActionListener实例传递给异步方法: client.indexAsync(indexRequest2, listener); //Index Response //返回的IndexResponse允许检索有关执行操作的信息,如下所示: String index = indexResponse.getIndex(); String type = indexResponse.getType(); String id = indexResponse.getId(); long version = indexResponse.getVersion(); if (indexResponse.getResult() == DocWriteResponse.Result.CREATED) { //处理(如果需要)第一次创建文档的情况 } else if (indexResponse.getResult() == DocWriteResponse.Result.UPDATED) { //处理(如果需要)文档被重写的情况 } ReplicationResponse.ShardInfo shardInfo = indexResponse.getShardInfo(); if (shardInfo.getTotal() != shardInfo.getSuccessful()) { //处理成功分片数量少于总分片数量的情况 } if (shardInfo.getFailed() > 0) { for (ReplicationResponse.ShardInfo.Failure failure : shardInfo.getFailures()) { String reason = failure.reason();//处理潜在的失败 } } //如果存在版本冲突,则会抛出ElasticsearchException: IndexRequest request = new IndexRequest("posts", "doc", "1") .source("field", "value") .version(1); try { IndexResponse response = client.index(request); } catch(ElasticsearchException e) { if (e.status() == RestStatus.CONFLICT) { //引发的异常表示返回了版本冲突错误 } } //如果opType设置为创建但是具有相同索引,类型和ID的文档已存在,则也会发生同样的情况: request = new IndexRequest("posts", "doc", "1") .source("field", "value") .opType(DocWriteRequest.OpType.CREATE); try { IndexResponse response = client.index(request); } catch(ElasticsearchException e) { if (e.status() == RestStatus.CONFLICT) { //引发的异常表示返回了版本冲突错误 } }
Get API
RestHighLevelClient client = new RestHighLevelClient( RestClient.builder( new HttpHost("localhost", 9200, "http"), new HttpHost("localhost", 9201, "http"))); GetRequest getRequest = new GetRequest( "posts",//索引 "doc",//类型 "1");//文档ID //===============================可选参数start==================================== //禁用_source检索,默认为启用 getRequest.fetchSourceContext(new FetchSourceContext(false)); //为特定字段配置_source_include String[] includes = new String[]{"message", "*Date"}; String[] excludes = Strings.EMPTY_ARRAY; FetchSourceContext fetchSourceContext = new FetchSourceContext(true, includes, excludes); getRequest.fetchSourceContext(fetchSourceContext); //为指定字段配置_source_exclude String[] includes1 = Strings.EMPTY_ARRAY; String[] excludes1 = new String[]{"message"}; FetchSourceContext fetchSourceContext1 = new FetchSourceContext(true, includes, excludes); getRequest.fetchSourceContext(fetchSourceContext); //配置指定stored_fields的检索(要求字段在映射中单独存储) getRequest.storedFields("message"); GetResponse getResponse = client.get(getRequest); //检索message 存储字段(要求将字段分开存储在映射中) String message = getResponse.getField("message").getValue(); getRequest.routing("routing");//设置routing值 getRequest.parent("parent");//设置parent值 getRequest.preference("preference");//设置preference值 getRequest.realtime(false);//设置realtime为false,默认是true getRequest.refresh(true);//在检索文档之前执行刷新(默认为false) getRequest.version(2);//设置版本 getRequest.versionType(VersionType.EXTERNAL);//设置版本类型 //===============================可选参数end==================================== //同步执行 GetResponse getResponse1 = client.get(getRequest); //异步执行 //GetResponse 的典型监听器如下所示: //异步方法不会阻塞并立即返回。 ActionListener<GetResponse> listener = new ActionListener<GetResponse>() { @Override public void onResponse(GetResponse getResponse) { //执行成功时调用。 Response以参数方式提供 } @Override public void onFailure(Exception e) { //在失败的情况下调用。 引发的异常以参数方式提供 } }; //异步执行获取索引请求需要将GetRequest 实例和ActionListener实例传递给异步方法: client.getAsync(getRequest, listener); //Get Response //返回的GetResponse允许检索请求的文档及其元数据和最终存储的字段。 String index = getResponse.getIndex(); String type = getResponse.getType(); String id = getResponse.getId(); if (getResponse.isExists()) { long version = getResponse.getVersion(); String sourceAsString = getResponse.getSourceAsString();//检索文档(String形式) Map<String, Object> sourceAsMap = getResponse.getSourceAsMap();//检索文档(Map<String, Object>形式) byte[] sourceAsBytes = getResponse.getSourceAsBytes();//检索文档(byte[]形式) } else { /* 处理找不到文档的情况。 请注意,尽管返回404状态码, 但返回的是有效的GetResponse,而不是抛出的异常。 此类Response不包含任何源文档,并且其isExists方法返回false。*/ } //当针对不存在的索引执行获取请求时,响应404状态码,将引发ElasticsearchException,需要按如下方式处理: GetRequest request = new GetRequest("does_not_exist", "doc", "1"); try { GetResponse getResponse2 = client.get(request); } catch (ElasticsearchException e) { if (e.status() == RestStatus.NOT_FOUND) { //处理因为索引不存在而抛出的异常情况 } } //如果请求了特定的文档版本,并且现有文档具有不同的版本号,则会引发版本冲突: try { GetRequest request1 = new GetRequest("posts", "doc", "1").version(2); GetResponse getResponse3 = client.get(request); } catch (ElasticsearchException exception) { if (exception.status() == RestStatus.CONFLICT) { //引发的异常表示返回了版本冲突错误 } }
Delete API
RestHighLevelClient client = new RestHighLevelClient( RestClient.builder( new HttpHost("localhost", 9200, "http"), new HttpHost("localhost", 9201, "http"))); DeleteRequest request = new DeleteRequest ( "posts",//索引 "doc",//类型 "1");//文档ID //===============================可选参数==================================== request.routing("routing");//设置routing值 request.parent("parent");//设置parent值 //设置超时:等待主分片变得可用的时间 request.timeout(TimeValue.timeValueMinutes(2));//TimeValue方式 request.timeout("1s");//字符串方式 //刷新策略 request.setRefreshPolicy(WriteRequest.RefreshPolicy.WAIT_UNTIL);//WriteRequest.RefreshPolicy实例方式 request.setRefreshPolicy("wait_for");//字符串方式 request.version(2);//设置版本 request.versionType(VersionType.EXTERNAL);//设置版本类型 //同步执行 DeleteResponse deleteResponse = client.delete(request); //异步执行 //DeleteResponse 的典型监听器如下所示: //异步方法不会阻塞并立即返回。 ActionListener<DeleteResponse > listener = new ActionListener<DeleteResponse >() { @Override public void onResponse(DeleteResponse getResponse) { //执行成功时调用。 Response以参数方式提供 } @Override public void onFailure(Exception e) { //在失败的情况下调用。 引发的异常以参数方式提供 } }; //异步执行获取索引请求需要将DeleteRequest 实例和ActionListener实例传递给异步方法: client.deleteAsync(request, listener); //Delete Response //返回的DeleteResponse允许检索有关执行操作的信息,如下所示: String index = deleteResponse.getIndex(); String type = deleteResponse.getType(); String id = deleteResponse.getId(); long version = deleteResponse.getVersion(); ReplicationResponse.ShardInfo shardInfo = deleteResponse.getShardInfo(); if (shardInfo.getTotal() != shardInfo.getSuccessful()) { //处理成功分片数量少于总分片数量的情况 } if (shardInfo.getFailed() > 0) { for (ReplicationResponse.ShardInfo.Failure failure : shardInfo.getFailures()) { String reason = failure.reason();//处理潜在的失败 } } //还可以检查文档是否被找到: DeleteRequest request1 = new DeleteRequest("posts", "doc", "does_not_exist"); DeleteResponse deleteResponse1 = client.delete(request); if (deleteResponse.getResult() == DocWriteResponse.Result.NOT_FOUND) { //如果找不到要删除的文档,执行某些操作 } //如果存在版本冲突,则会抛出ElasticsearchException: try { DeleteRequest request2 = new DeleteRequest("posts", "doc", "1").version(2); DeleteResponse deleteResponse2 = client.delete(request); } catch (ElasticsearchException exception) { if (exception.status() == RestStatus.CONFLICT) { //引发的异常表示返回了版本冲突错误 } }
Update API
RestHighLevelClient client = new RestHighLevelClient( RestClient.builder( new HttpHost("localhost", 9200, "http"), new HttpHost("localhost", 9201, "http"))); UpdateRequest request = new UpdateRequest ( "test",//索引 "_doc",//类型 "1");//文档ID //更新API允许通过使用脚本或传递部分文档来更新现有文档。 //使用脚本 //方式1:该脚本可以作为内联脚本提供: Map<String, Object> parameters = singletonMap("count", 4);//脚本参数 //使用painless语言和上面的参数创建一个内联脚本 Script inline = new Script(ScriptType.INLINE, "painless", "ctx._source.field += params.count", parameters); request.script(inline); //方式2:引用名称为increment-field的脚本,改脚本定义的位置还没搞清楚。 Script stored = new Script(ScriptType.STORED, null, "increment-field", parameters); request.script(stored); //只更新部分 //更新部分文档时,更新的部分文档将与现有文档合并。 //方式1:使用字符串形式 UpdateRequest request1 = new UpdateRequest("posts", "doc", "1"); String jsonString = "{" + "\"updated\":\"2017-01-01\"," + "\"reason\":\"daily update\"" + "}"; request1.doc(jsonString, XContentType.JSON); //方式2:使用Map形式,会被自动转为json格式 Map<String, Object> jsonMap = new HashMap<>(); jsonMap.put("updated", new Date()); jsonMap.put("reason", "daily update"); UpdateRequest request2 = new UpdateRequest("posts", "doc", "1") .doc(jsonMap); //方式3:使用XContentBuilder形式 XContentBuilder builder = XContentFactory.jsonBuilder(); builder.startObject(); { builder.field("updated", new Date()); builder.field("reason", "daily update"); } builder.endObject(); UpdateRequest request3 = new UpdateRequest("posts", "doc", "1") .doc(builder); //方式4:使用Object key-pairs形式 UpdateRequest request4 = new UpdateRequest("posts", "doc", "1") .doc("updated", new Date(), "reason", "daily update"); //如果文档尚不存在,则可以使用upsert方法定义一些将作为新文档插入的内容: //与部分文档更新类似,可以使用接受String,Map,XContentBuilder或Object key-pairs的方式来定义upsert文档的内容。 String jsonString1 = "{\"created\":\"2017-01-01\"}"; request.upsert(jsonString1, XContentType.JSON); //=========================可选参数=========================== request.routing("routing");//设置routing值 request.parent("parent");//设置parent值 //设置超时:等待主分片变得可用的时间 request.timeout(TimeValue.timeValueSeconds(1));//TimeValue方式 request.timeout("1s");//字符串方式 //刷新策略 request.setRefreshPolicy(WriteRequest.RefreshPolicy.WAIT_UNTIL);//WriteRequest.RefreshPolicy实例方式 request.setRefreshPolicy("wait_for");//字符串方式 //如果要更新的文档在获取或者索引阶段已被另一操作更改,则重试更新操作的次数 request.retryOnConflict(3); request.version(2);//设置版本 request.fetchSource(true); //启用_source检索,默认为禁用 //为特定字段配置_source_include String[] includes = new String[]{"updated", "r*"}; String[] excludes = Strings.EMPTY_ARRAY; request.fetchSource(new FetchSourceContext(true, includes, excludes)); //为指定字段配置_source_exclude String[] includes1 = Strings.EMPTY_ARRAY; String[] excludes1 = new String[]{"updated"}; request.fetchSource(new FetchSourceContext(true, includes1, excludes1)); request.detectNoop(false);//禁用noop检测 //无论文档是否存在,脚本都必须运行,即如果脚本尚不存在,则脚本负责创建文档。 request.scriptedUpsert(true); //如果不存在,则表明部分文档必须用作upsert文档。 request.docAsUpsert(true); //设置在继续更新操作之前必须激活的分片副本的数量。 request.waitForActiveShards(2); //使用ActiveShardCount方式,可以是ActiveShardCount.ALL,ActiveShardCount.ONE或ActiveShardCount.DEFAULT(默认值) request.waitForActiveShards(ActiveShardCount.ALL); //同步执行 UpdateResponse updateResponse = client.update(request); //异步执行 //DeleteResponse 的典型监听器如下所示: //异步方法不会阻塞并立即返回。 ActionListener<UpdateResponse > listener = new ActionListener<UpdateResponse >() { @Override public void onResponse(UpdateResponse updateResponse) { //执行成功时调用。 Response以参数方式提供 } @Override public void onFailure(Exception e) { //在失败的情况下调用。 引发的异常以参数方式提供 } }; //异步执行获取索引请求需要将UpdateRequest 实例和ActionListener实例传递给异步方法: client.updateAsync(request, listener); //Update Response //返回的UpdateResponse允许检索有关执行操作的信息,如下所示: String index = updateResponse.getIndex(); String type = updateResponse.getType(); String id = updateResponse.getId(); long version = updateResponse.getVersion(); if (updateResponse.getResult() == DocWriteResponse.Result.CREATED) { //处理第一次创建文档的情况(upsert) } else if (updateResponse.getResult() == DocWriteResponse.Result.UPDATED) { //处理文档被更新的情况 } else if (updateResponse.getResult() == DocWriteResponse.Result.DELETED) { //处理文档已被删除的情况 } else if (updateResponse.getResult() == DocWriteResponse.Result.NOOP) { //处理文档未受更新影响的情况,即文档上未执行任何操作(noop) } //当通过fetchSource方法在UpdateRequest中启用源检索时,响应会包含已更新文档: GetResult result = updateResponse.getGetResult();//获取已更新的文档 if (result.isExists()) { String sourceAsString = result.sourceAsString();//获取已更新的文档源(String方式) Map<String, Object> sourceAsMap = result.sourceAsMap();//获取已更新的文档源(Map方式) byte[] sourceAsBytes = result.source();//获取已更新的文档源(byte[]方式) } else { //处理不返回文档源的场景(默认就是这种情况) } //也可以检查分片失败: ReplicationResponse.ShardInfo shardInfo = updateResponse.getShardInfo(); if (shardInfo.getTotal() != shardInfo.getSuccessful()) { //处理成功分片数量少于总分片数量的情况 } if (shardInfo.getFailed() > 0) { for (ReplicationResponse.ShardInfo.Failure failure : shardInfo.getFailures()) { String reason = failure.reason();//处理潜在的失败 } } //当针对文档不存在时,响应404状态码,将引发ElasticsearchException,需要按如下方式处理: UpdateRequest request5 = new UpdateRequest("posts", "type", "does_not_exist").doc("field", "value"); try { UpdateResponse updateResponse5 = client.update(request); } catch (ElasticsearchException e) { if (e.status() == RestStatus.NOT_FOUND) { //处理由于文档不存在抛出的异常 } } //如果存在版本冲突,则会抛出ElasticsearchException: UpdateRequest request6 = new UpdateRequest("posts", "doc", "1") .doc("field", "value") .version(1); try { UpdateResponse updateResponse6 = client.update(request); } catch(ElasticsearchException e) { if (e.status() == RestStatus.CONFLICT) { //引发的异常表示返回了版本冲突错误 } }
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