【Elasticsearch】elasticsearch 7.x 查看分片未分配 (UNASSIGNED) 的原因 /_cluster/allocation/explain

1.概述

官网：https://www.elastic.co/guide/en/elasticsearch/reference/current/cluster-allocation-explain.html

http://doc.codingdict.com/elasticsearch/225/

es集群经常会出现索引分片UNASSIGNED的情况，有时候会导致索引无法正常使用，如下

index                        shard prirep state       docs  store ip        node
re_index_1                   0     p      STARTED        0   283b 127.0.0.1 lcc
re_index_1                   0     r      UNASSIGNED