Elasticsearch 报错及解决

报错：

Fielddata is disabled on text fields by default.  Set `fielddata=true` on
[`your_field_name`] in order to load  fielddata in memory by uninverting the
inverted index. Note that this can however use significant memory.

解决：https://www.elastic.co/guide/en/elasticsearch/reference/current/fielddata.html#enable-fielddata-text-fields

报错：

[2022-09-28T11:22:13,306][ERROR][o.e.b.ElasticsearchUncaughtExceptionHandler] [master] uncaught exception in thread [main]
org.elasticsearch.bootstrap.StartupException: ElasticsearchException[failed to load metadata]; nested: LockObtainFailedException[Lock held by another program: /app/elasticsearch-7.10.2/data/nodes/0/_state/write.lock];

解决：

cd /app/elasticsearch-7.10.2/data/nodes/0/_state
rm -rf write.lock

报错：

[2022-09-28T11:28:58,503][ERROR][o.e.b.ElasticsearchUncaughtExceptionHandler] [master] uncaught exception in thread [main]
org.elasticsearch.bootstrap.StartupException: BindHttpException[Failed to bind to 0.0.0.0:9200]; nested: BindException[地址已在使用];

解决：

ps -ef | grep 9200
kill -9 【9220占用的进程号】

报错【版本：7.10.2】

访问kibana页面： http://49.232.142.28:5601/ 时，报错：Kibana server is not ready yet
此时，elasticsearch报错：{"type":"log","@timestamp":"2022-10-17T08:19:55Z","tags":["error","elasticsearch","data"],"pid":21103,"message":"[master_not_discovered_exception]: master_not_discovered_exception"}
解决：
配置 elasticsearch-7.10.2/config/elasticsearch.yml，修改行：cluster.initial_master_nodes: ["master"]

报错：Elasticsearch使用问题—TOO_MANY_REQUESTS/12/disk usage exceeded flood-stage watermark

原文链接：https://www.cnblogs.com/nutural/articles/16566266.html

启动报错：max virtual memory areas vm.max_map_count [65530] is too low, increase to at least [262144]

解决：以root用户身份修改 /etc/sysctl.conf 文件，添加一行：vm.max_map_count = 262144，然后生效：sysctl -p