cluster_settings.json

{
  "persistent": {
    "logger": {
      "org": {
        "elasticsearch": {
          "deprecation": "ERROR"
        }
      }
    }
  },
  "transient": {
    "cluster": {
      "routing": {
        "allocation": {
          "cluster_concurrent_rebalance": "2",
          "node_concurrent_recoveries": "2",
          "enable": "all"
        }
      }
    },
    "indices": {
      "recovery": {
        "max_bytes_per_sec": "100mb"
      }
    }
  }
}