Elasticsearch：ES 常见报错及解决办法

处理 AttributeError: ‘Response’ object has no attribute ‘my_suggest’ 异常

环境
- windows 10；
- elasticsearch 7.8.0；
- Django
问题
- 使用 elasticsearch + Django 搭建搜索引擎，在获取 suggest 时遇到 AttributeError: ‘Response’ object has no attribute ‘my_suggest’ 报错，
- 问题代码如下： ``` from SEARCH.models import ArticleType # 注意：ArticleType 是在另一个文件单独定义的！ from django.http import HttpResponse from elasticsearch import Elasticsearch from datetime import datetime
client = Elasticsearch(hosts=[“127.0.0.1”])

s = ArticleType.search() s = s.suggest( ‘my_suggest’, “xx”, completion={ “field”: “suggest”, “fuzzy”: { “fuzziness”: 2 }, “size”: 10 } ) suggestions = s.execute() ```
报错如下：

KeyError: ‘my_suggest’

During handling of the above exception, another exception occurred:

Traceback (most recent call last): File “C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\django\core\handlers\exception.py”, line 34, in inner response = get_response(request) File “C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\django\core\handlers\base.py”, line 115, in _get_response response = self.process_exception_by_middleware(e, request) File “C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\django\core\handlers\base.py”, line 113, in _get_response response = wrapped_callback(request, *callback_args, **callback_kwargs) File “C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\django\views\generic\base.py”, line 71, in view return self.dispatch(request, *args, **kwargs) File “C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\django\views\generic\base.py”, line 97, in dispatch return handler(request, *args, **kwargs) File “C:\Users\Administrator\Desktop\E_engine\E_search\SEARCH\views.py”, line 36, in get for match in suggestions.my_suggest[0].options: File “C:\Users\Administrator\AppData\Local\Programs\Python\Python37\lib\site-packages\elasticsearch_dsl\utils.py”, line 130, in getattr ‘{!r} object has no attribute {!r}’.format(self.class.name, attr_name)) AttributeError: ‘Response’ object has no attribute ‘my_suggest’
原因
- elasticsearch 版本更新导致用法变更，问题代码是旧的写法，需要将 s.execute_suggest() 变更为 s.execute().to_dict()；

解决：

更新代码

from django.http import HttpResponse
from elasticsearch import Elasticsearch
from datetime import datetime
  
client = Elasticsearch(hosts=["127.0.0.1"])
  
s = ArticleType.search()
s = s.suggest(
    'my_suggest',
    "九州",
    completion={
        "field": "suggest",
        "fuzzy": {
            "fuzziness": 2
        },
        "size": 10
    }
)
# 调用 execute_suggest 方法
# suggestions = s.execute()
suggestions = s.execute().to_dict()    # 此处将 s.execute_suggest()  变更为  s.execute().to_dict()
print("#" * 50)
print(suggestions)
print("#" * 50)

处理 analyzer [ik_max_word] not found for field [name] 异常

环境
- windows 10；
- elasticsearch 7.8.0；
问题
- elasticsearch 创建索引时遇到 analyzer [ik_max_word] not found for field [name] 报错；
- 报错：
  
  org.elasticsearch.index.mapper.MapperParsingException: analyzer [ik_max_word] not found for field [name]
原因
- IK分词器插件未安装；
解决
- 进入 elasticsearch 安装目录下的 bin\ 目录，在此目录打开命令行窗口，输入下面代码安装IK分词器插件；
```
elasticsearch-plugin install https://github.com/medcl/elasticsearch-analysis-ik/releases/download/vX.X.X/elasticsearch-analysis-ik-X.X.X.zip
```
- 安装成功，如下图：
- 重启 elasticsearch，重新创建索引，不在报错、创建成功；

elasticsearch-head 连接不上 Elasticsearch，localhost:9100 显示集群健康值：未连接

环境
- windows 10；
- elasticsearch 7.8.0；
- elasticsearch-head；
问题
- 启动 elasticsearch 和 elasticsearch-head 以后，http://localhost:9100/ 页面显示 集群健康值：未连接，点击连接按钮以后没有任何反应；

解决

原因：config/elasticsearch.yml 文件的配置问题；

进入 elasticsearch/config 文件夹，打开 elasticsearch.yml 文件，在文件尾部添加如下代码；

# 开启跨域访问支持，默认为false
http.cors.enabled: true
# 跨域访问允许的域名地址
http.cors.allow-origin: "*"
# 通过为 cluster.initial_master_nodes 参数设置符合主节点条件的节点的 IP 地址来引导启动集群
cluster.initial_master_nodes: ["node-1"]

保存文件后重启 elasticsearch 和 elasticsearch-head；
问题解决，如下图：

Elasticsearch：ES 常见报错及解决办法

处理 AttributeError: ‘Response’ object has no attribute ‘my_suggest’ 异常

处理 analyzer [ik_max_word] not found for field [name] 异常

elasticsearch-head 连接不上 Elasticsearch，localhost:9100 显示集群健康值：未连接

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