unassigned_shards一直无法分配， number_of_in_flight_fetch 过高，

cluster health显示  unassigned_shards 一直无法分配，  "number_of_in_flight_fetch": 1080 较高且一直没有变化
 

{

"cluster_name": "ESNewMedia",

"status": "red",

"timed_out": false,

"number_of_nodes": 57,

"number_of_data_nodes": 53,

"active_primary_shards": 26214,

"active_shards": 45251,

"relocating_shards": 0,

"initializing_shards": 0,

"unassigned_shards": 374,

"delayed_unassigned_shards": 0,

"number_of_pending_tasks": 0,

"number_of_in_flight_fetch": 1080,

"task_max_waiting_in_queue_millis": 0,

"active_shards_percent_as_number": 99.18027397260273

}

explain显示可以分配

"index": "sj_shrink",

"shard": 0,

"primary": true,

"current_state": "unassigned",

"unassigned_info": {

"reason": "NODE_LEFT",

"at": "2020-06-18T07:42:51.849Z",

"details": "node_left [vszUScqBQ0OeZZH9LA9p-w]",

"last_allocation_status": "awaiting_info"

},

"can_allocate": "yes",

"allocate_explanation": "can allocate the shard",