Yellow Shard

Hello,

I'm having some issue with an elasticsearch install, I don't have extensive knowledge on ES but your help would be appreciated.

2 issues:

  • ES is regulary stuck and i have to restart it manually
  • ES is in yellow state

Bellow some informations :

$ curl localhost:9200/_cluster/allocation/explain

{
   "index":"atom",
   "shard":3,
   "primary":false,
   "current_state":"unassigned",
   "unassigned_info":{
      "reason":"CLUSTER_RECOVERED",
      "at":"2020-10-19T08:21:59.949Z",
      "last_allocation_status":"no_attempt"
   },
   "can_allocate":"no",
   "allocate_explanation":"cannot allocate because allocation is not permitted to any of the nodes",
   "node_allocation_decisions":[
      {
         "node_id":"trIWPSYfT9WARbEZ7iWXAA",
         "node_name":"trIWPSY",
         "transport_address":"127.0.0.1:9300",
         "node_decision":"no",
         "deciders":[
            {
               "decider":"same_shard",
               "decision":"NO",
               "explanation":"the shard cannot be allocated to the same node on which a copy of the shard already exists [[atom][3], node[trIWPSYfT9WARbEZ7iWXAA], [P], s[STARTED], a[id=2-V7gQ5HQxyf2TR2VP99Jw]]"
            }
         ]
      }
   ]
}

curl -XGET 'http://localhost:9200/_cluster/health/?level=shards&pretty=true'

      "cluster_name" : "elasticsearch",
      "status" : "yellow",
      "timed_out" : false,
      "number_of_nodes" : 1,
      "number_of_data_nodes" : 1,
      "active_primary_shards" : 8,
      "active_shards" : 8,
      "relocating_shards" : 0,
      "initializing_shards" : 0,
      "unassigned_shards" : 8,
      "delayed_unassigned_shards" : 0,
      "number_of_pending_tasks" : 0,
      "number_of_in_flight_fetch" : 0,
      "task_max_waiting_in_queue_millis" : 0,
      "active_shards_percent_as_number" : 50.0,
      "indices" : {
        "atom" : {
          "status" : "yellow",
          "number_of_shards" : 4,
          "number_of_replicas" : 1,
          "active_primary_shards" : 4,
          "active_shards" : 4,
          "relocating_shards" : 0,
          "initializing_shards" : 0,
          "unassigned_shards" : 4,
          "shards" : {
            "0" : {
              "status" : "yellow",
              "primary_active" : true,
              "active_shards" : 1,
              "relocating_shards" : 0,
              "initializing_shards" : 0,
              "unassigned_shards" : 1
            },
            "1" : {
              "status" : "yellow",
              "primary_active" : true,
              "active_shards" : 1,
              "relocating_shards" : 0,
              "initializing_shards" : 0,
              "unassigned_shards" : 1
            },
            "2" : {
              "status" : "yellow",
              "primary_active" : true,
              "active_shards" : 1,
              "relocating_shards" : 0,
              "initializing_shards" : 0,
              "unassigned_shards" : 1
            },
            "3" : {
              "status" : "yellow",
              "primary_active" : true,
              "active_shards" : 1,
              "relocating_shards" : 0,
              "initializing_shards" : 0,
              "unassigned_shards" : 1
            }
          }
        },
        "ratp" : {
          "status" : "yellow",
          "number_of_shards" : 4,
          "number_of_replicas" : 1,
          "active_primary_shards" : 4,
          "active_shards" : 4,
          "relocating_shards" : 0,
          "initializing_shards" : 0,
          "unassigned_shards" : 4,
          "shards" : {
            "0" : {
              "status" : "yellow",
              "primary_active" : true,
              "active_shards" : 1,
              "relocating_shards" : 0,
              "initializing_shards" : 0,
              "unassigned_shards" : 1
            },
            "1" : {
              "status" : "yellow",
              "primary_active" : true,
              "active_shards" : 1,
              "relocating_shards" : 0,
              "initializing_shards" : 0,
              "unassigned_shards" : 1
            },
            "2" : {
              "status" : "yellow",
              "primary_active" : true,
              "active_shards" : 1,
              "relocating_shards" : 0,
              "initializing_shards" : 0,
              "unassigned_shards" : 1
            },
            "3" : {
              "status" : "yellow",
              "primary_active" : true,
              "active_shards" : 1,
              "relocating_shards" : 0,
              "initializing_shards" : 0,
              "unassigned_shards" : 1
            }
          }
        }
      }
    }

how many elasticsearch node do you have in this cluster?

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