All of the primary shards are on 1 node. Would that bottlenecks our writes?

Elastic Stack Elasticsearch
5

No, we are sending it to all nodes. Any workaround to fix this?

The current status is as below:

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{
  "cluster_name" : "cluster",
  "status" : "green",
  "timed_out" : false,
  "number_of_nodes" : 3,
  "number_of_data_nodes" : 3,
  "active_primary_shards" : 464,
  "active_shards" : 1244,
  "relocating_shards" : 0,
  "initializing_shards" : 0,
  "unassigned_shards" : 0,
  "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" : 100.0
}