Elasticsearch数据库的基本使用及ES健康状态red问题处理_es数据库的使用

机器学习之心AI
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    GetIndexRequest request = new GetIndexRequest(esCreateVo.getIndex());
    boolean exists = restHighLevelClient.indices().exists(request, RequestOptions.DEFAULT);
    return exists ? true : false;
}


查询所有索引

public CommonResult selectIndexAll() throws IOException { GetAliasesRequest request = new GetAliasesRequest(); GetAliasesResponse alias = restHighLevelClient.indices().getAlias(request, RequestOptions.DEFAULT); Map<String, Set> aliases = alias.getAliases();

    Set<String> indices = aliases.keySet();
    List<EsCreateVo> esCreateVoList = new ArrayList<>();
    for (String s : indices) {
        EsCreateVo esCreateVo = new EsCreateVo();
        esCreateVo.setIndex(s);
        esCreateVoList.add(esCreateVo);
    }
    return new CommonResult().success(esCreateVoList);
}


创建文档

public CommonResult AddDocument(EsReqVO esReqVO) throws Exception { System.out.println("》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》执行创建所有文档"+ DateTime.now()); //上传文件，获取文件基本信息 MultipartFile file = esReqVO.getFile();

    String content = wordService.importDatas(file);

// DecimalFormat decimalFormat = new DecimalFormat("#0.000");

// 判断文件大小来转换并拼接 M单位 long size = file.getSize(); Double fileSizes =file.getSize()/1024/1024.; BigDecimal bigDecimal = BigDecimal.valueOf(fileSizes).setScale(2, BigDecimal.ROUND_HALF_UP);

    // 创建一个DocumentVO对象
    DocumentVO documentVO = new DocumentVO(file.getOriginalFilename(), String.valueOf(bigDecimal) + " M", DateTime.now().toString(), content);
    // 创建请求
    IndexRequest request = new IndexRequest(esReqVO.getIndex());
    // 制定规则 PUT /liuyou_index/_doc/1
    // request.id("13");// 设置文档ID，不设置自动生成
    request.timeout(TimeValue.timeValueMillis(1000));// request.timeout("1s")
    // 将我们的数据放入请求中
    request.source(JSON.toJSONString(documentVO), XContentType.JSON);
    // 客户端发送请求，获取响应的结果
    try {
        IndexResponse response = restHighLevelClient.index(request, RequestOptions.DEFAULT);
        System.out.println("======" + response.status());// 获取建立索引的状态信息 CREATED
        System.out.println("[[[[[[[[[" + response);// 查看返回内容
    } catch (Exception e) {
        String msg = e.getMessage();
        if (!msg.contains("201 Created") && !msg.contains("200 OK")) {
            throw e;
        }
    }
    try {
        Thread.sleep(1000);
    } catch (InterruptedException e) {
        e.printStackTrace();
    }
    return new CommonResult().success();
}


创建文档的时候 需要在return之前让线程休眠至少一秒，删除也一样，因为ES有一个机制是你创建或删除文档的时候，他不会立即刷新，而是把数据放到一个类似于暂存区的地方1秒，如果不执行现成休眠的话，前端操作完创建/删除的时候，调用查询接口会查询不到你刚新增的数据，或是删除的数据还在存在列表，这是个坑，一定要注意！！！



修改文档

public CommonResult UpdateDocument(@RequestBody DocumentsVO documentsVO) throws IOException { UpdateRequest request = new UpdateRequest(documentsVO.getIndex(), documentsVO.getId()); DocumentVO documentVO = new DocumentVO(); BeanUtil.copyProperties(documentsVO, documentVO); request.doc(JSON.toJSONString(documentVO), XContentType.JSON); try { UpdateResponse response = restHighLevelClient.update(request, RequestOptions.DEFAULT); System.out.println(response.status()); // OK restHighLevelClient.close(); } catch (Exception e) { String msg = e.getMessage(); if (!msg.contains("201 Created") && !msg.contains("200 OK")) { throw e; } }

    return new CommonResult().success();
}


查询某条文档信息的获取

public CommonResult GetDocument(String index, String id) throws IOException { GetRequest request = new GetRequest(index, id); GetResponse response = restHighLevelClient.get(request, RequestOptions.DEFAULT); System.out.println(response.getSourceAsString());// 打印文档内容 System.out.println(request);// 返回的全部内容和命令是一样的

    return new CommonResult().success(response.getSourceAsString());
}


文档的获取，并判断其是否存在

public CommonResult DocumentIsExists(String index, String id) throws IOException { GetRequest request = new GetRequest(index, id); // 不获取返回的 _source的上下文了 request.fetchSourceContext(new FetchSourceContext(false)); request.storedFields("none"); boolean exists = restHighLevelClient.exists(request, RequestOptions.DEFAULT); System.out.println(exists);

    return exists ? new CommonResult().success(exists) : new CommonResult().failed("文档不存在！");
}


删除文档

public CommonResult DeleteDocument(@RequestParam String index, @RequestParam String id) throws IOException { System.out.println("》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》执行删除文档"+ DateTime.now()); DeleteRequest request = new DeleteRequest(index, id); request.timeout("1s"); try { restHighLevelClient.delete(request, RequestOptions.DEFAULT);

    } catch (Exception e) {
        String msg = e.getMessage();
        if (!msg.contains("201 Created") && !msg.contains("200 OK")) {
            throw e;
        }
    }
    try {
        Thread.sleep(1000);
    } catch (InterruptedException e) {
        e.printStackTrace();
    }
    return new CommonResult().success();
}


根据索引查询所有文档

public CommonResult SearchsDocument(@RequestParam(value = "fileName", required = false) String fileName, @RequestParam(value = "index", required = false) String index, @RequestParam("pageNo") int pageNo, @RequestParam("pageSize") int pageSize) throws IOException { System.out.println("》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》执行查询所有文档"+ DateTime.now()); System.out.println("》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》索引名称"+ index); // 创建查询请求对象 SearchRequest searchRequest = new SearchRequest(index); // 构建搜索条件 SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder(); BoolQueryBuilder boolQueryBuilder = null; if (StrUtil.isNotBlank(fileName)){ boolQueryBuilder = QueryBuilders.boolQuery(); boolQueryBuilder.must(QueryBuilders.matchQuery("name",fileName)); }

    //设置高亮
    searchSourceBuilder.highlighter(new HighlightBuilder());
    //设置分页
    searchSourceBuilder.from(pageNo);
    searchSourceBuilder.size(pageSize);

// 设置排序条件 searchSourceBuilder.sort("time.keyword", SortOrder.DESC); searchSourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS)); searchSourceBuilder.query(boolQueryBuilder);

    searchRequest.source(searchSourceBuilder);
    SearchResponse search = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);
    SearchHits hits = search.getHits();
    //获取总条数
    JSONObject jsonObject = JSON.parseObject(JSON.toJSONString(hits));

// 设置总条数 jsonObject.put("total", hits.getTotalHits().value); if (hits.getHits().length != 0 && StrUtil.isNotBlank(hits.getHits()[0].getIndex())){ // 给每条数据都设置索引 jsonObject.getJSONArray("hits").getJSONObject(0).getJSONObject("sourceAsMap").put("index", hits.getHits()[0].getIndex()); }

    return new CommonResult().success(jsonObject);

}


搭建的ES库不仅可以用来存储用户使用的数据，我们项目中还配置了，jar包每次启动后都会把日志文件给存储到ES库中这就间接的导致了几个问题：


   1.日志索引查询报错


解决方案：

@GetMapping("/searchsDocument") @ApiOperation("根据索引查询所有文档") public Result SearchsDocument(@RequestParam(value = "fileName", required = false) String fileName, @RequestParam(value = "index", required = false) String index, @RequestParam("pageNo") int pageNo, @RequestParam("pageSize") int pageSize) throws IOException { System.out.println("》》》》》》》》》》》》》》》》》》》》》》》》》》》》》》执行查询所有文档"+ DateTime.now()); PageHelper.startPage(pageNo, pageSize); // 创建查询请求对象 SearchRequest searchRequest = new SearchRequest(index); // 构建搜索条件 SearchSourceBuilder searchSourceBuilder = new SearchSourceBuilder(); BoolQueryBuilder boolQueryBuilder = null; if (StrUtil.isNotBlank(fileName)){ boolQueryBuilder = QueryBuilders.boolQuery(); boolQueryBuilder.must(QueryBuilders.matchQuery("name",fileName)); }

//设置高亮 searchSourceBuilder.highlighter(new HighlightBuilder()); //设置分页 searchSourceBuilder.from(pageNo); searchSourceBuilder.size(pageSize);

// 设置排序条件 // searchSourceBuilder.sort("time.keyword", SortOrder.DESC); searchSourceBuilder.timeout(new TimeValue(60, TimeUnit.SECONDS)); searchSourceBuilder.query(boolQueryBuilder);

    searchRequest.source(searchSourceBuilder);
    SearchResponse search = restHighLevelClient.search(searchRequest, RequestOptions.DEFAULT);

    List<DocumentPageVO> list = new ArrayList<>();
    if(ObjectUtils.isEmpty(search.getHits().getHits())){
        return Result.success(new PageInfo<>());
    }

// 循环从ES中获取的数据，使用if判断判断数据结构是否一致，如不一致，则不进行返回 for (SearchHit hit : search.getHits().getHits()) { // 数据组装 DocumentPageVO documentVO = new DocumentPageVO(); documentVO.setIndex(hit.getIndex()); documentVO.setId(hit.getId());

        if (ObjectUtils.isNotEmpty(hit.getSourceAsMap().get("name"))){
            documentVO.setName(hit.getSourceAsMap().get("name").toString());
        }
        if (ObjectUtils.isNotEmpty(hit.getSourceAsMap().get("size"))){
            documentVO.setSize(hit.getSourceAsMap().get("size").toString());
        }
        if (ObjectUtils.isNotEmpty(hit.getSourceAsMap().get("content"))){
            documentVO.setContent(hit.getSourceAsMap().get("content").toString());
        }
        if (ObjectUtils.isNotEmpty(hit.getSourceAsMap().get("time"))){
            documentVO.setTime(hit.getSourceAsMap().get("time").toString());
        }
        if (ObjectUtils.isNotEmpty(hit.getSourceAsMap().get("name")) && ObjectUtils.isNotEmpty(hit.getSourceAsMap().get("size"))){
            list.add(documentVO);
        }

    }

// Collections.sort(list, Comparator.comparing(DocumentPageVO::getTime).reversed());

    SearchHits hits = search.getHits();

//获取总条数 JSONObject jsonObject = JSON.parseObject(JSON.toJSONString(hits));

// 设置总条数 jsonObject.put("total", hits.getTotalHits().value); if (hits.getHits().length != 0 && StrUtil.isNotBlank(hits.getHits()[0].getIndex())){ // 给每条数据都设置索引 jsonObject.getJSONArray("hits").getJSONObject(0).getJSONObject("sourceAsMap").put("index", hits.getHits()[0].getIndex()); }

    return Result.success(new PageInfo<>(list));

}


因为在ES中执行新增数据操作时，是自定义的字段，如下

public class DocumentVO {

@ApiModelProperty("文档名称")
private String name;

@ApiModelProperty("文档大小")
private String size;

@ApiModelProperty("文档时间")
private String time;

@ApiModelProperty("文档内容")
private String content;

}


但是插入日志时，使用的字段和该实体类对象不一致，导致取值的时候有取不到的情况


   2.新建索引不会自动分片，导致索引状态为红色，简介导致集群状态也为红色 


通过发送请求的方式开启自动平衡分配原则


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