ES维护常见问题（持续更新）

curl xxx/_cat/shards?v | grep UNASSIGNED

curl -XGET 'http://xxx/_cluster/allocation/explain?pretty' -d '{
    "index": "index_name",
    "shard": 0,
    "primary": true
}'

a. 某个节点的某个磁盘满（手动移动分片到大磁盘机器即可，最好用大磁盘机器）
b. allocation 限制，不能分配（修改allocation的规则即可）
c. 重试次数达到限制，依然不能分配（手动尝试即可 curl -XPOST 'xxx/_cluster/reroute?retry_failed&pretty'）

curl -XPUT 'http: //xxx/_cluster/settings?pretty' -d'{
    "transient": {
        "cluster.routing.allocation.exclude._ip": ["ip1","ip2","ip3"]
    }
}'

curl -XPUT 'http: //xxx/_cluster/settings?pretty' -d'{
    "transient": {
        "cluster.routing.allocation.exclude._ip": "ip1, ip2, ip3"
    }
}'

curl -XPUT 'http: //xxx/_cluster/settings?pretty' -d'{
    "transient": {
        "cluster.routing.allocation.exclude._ip": "ip1,ip2,ip3"
    }
}'

Error injecting constructor, ElasticsearchException[java.io.IOException: failed to read [id:2, legacy:false, file:/data2/search/data/nodes/0/indices/QNpDowX_TwiIiqZlB9e92g/_state/state-2.st]]; nested: IOException[failed to read [id:2, legacy:false, file:/data2/search/data/nodes/0/indices/QNpDowX_TwiIiqZlB9e92g/_state/state-2.st]]; nested: IllegalStateException[class org.apache.lucene.store.BufferedChecksumIndexInput cannot seek backwards (pos=-16 getFilePointer()=0)];
  at org.elasticsearch.gateway.GatewayMetaState.<init>(Unknown Source)
  while locating org.elasticsearch.gateway.GatewayMetaState
Caused by: ElasticsearchException[java.io.IOException: failed to read [id:2, legacy:false, file:/data2/search/data/nodes/0/indices/QNpDowX_TwiIiqZlB9e92g/_state/state-2.st]]; nested: IOException[failed to read [id:2, legacy:false, file:/data2/search/data/nodes/0/indices/QNpDowX_TwiIiqZlB9e92g/_state/state-2.st]]; nested: IllegalStateException[class org.apache.lucene.store.BufferedChecksumIndexInput cannot seek backwards (pos=-16 getFilePointer()=0)];

找出空文件删除即可：

find /data*/search/data/nodes/0/indices/ | grep state | grep "\.st" | xargs ls -l | awk '{if($5==0)print $0}' 
-rw-rw-r-- 1 search search    0 Oct  1 22:53 /data2/search/data/nodes/0/indices/QNpDowX_TwiIiqZlB9e92g/_state/state-2.st
-rw-rw-r-- 1 search search    0 Oct  1 22:53 /data3/search/data/nodes/0/indices/QNpDowX_TwiIiqZlB9e92g/_state/state-2.st
-rw-rw-r-- 1 search search    0 Oct  1 22:53 /data4/search/data/nodes/0/indices/QNpDowX_TwiIiqZlB9e92g/_state/state-1.st
-rw-rw-r-- 1 search search    0 Oct  1 22:53 /data4/search/data/nodes/0/indices/QNpDowX_TwiIiqZlB9e92g/_state/state-2.st

"reason" : "Trying to query 1344 shards, which is over the limit of 1000. This limit exists because querying 
many shards at the same time can make the job of the coordinating node very CPU and/or memory 
intensive. It is usually a better idea to have a smaller number of larger shards. Update 
[action.search.shard_count.limit] to a greater value if you really want to query that many shards at the same time."

curl -u admin:admin -XPUT 'https://localhost:9200/_cluster/settings' -H 'Content-Type: application/json' -d' 
{
    "persistent" : {
        "action.search.shard_count.limit" : "1500"
    }
}
'
or
curl -u admin:admin -XPUT 'https://localhost:9200/_cluster/settings' -H 'Content-Type: application/json' -d' 
{
    "transient" : {
        "action.search.shard_count.limit" : "1500"
    }
}
'

curl -XGET 'xx/xx/xx/AV9zRnrjq2szramqtpAT/_termvector?fields=strdescription&pretty=true'

curl -XPOST 'xxx/_analyze?pretty' -H 'Content-Type: application/json' -d'
{
  "tokenizer": "standard",
  "text": "2d711b09bd0db0ad240cc83b30dd8014,2d711b09bd0db0ad240cc83b30dd8014,2d711b09bd0db0ad240cc83b30dd8014,2d711b09bd0db0ad240cc83b30dd8014"
}
'