Why translog phase in recovery took a long time

Elastic Stack Elasticsearch
1

Elasticsearch-version：7.6.0
Translog stage recovered is 0, but it took 5min.What settings can optimize it?
my settings:

indices.recovery.max_concurrent_file_chunks : 5
indices.recovery.max_bytes_per_sec : 50MB
cluster.routing.allocation.node_initial_primaries_recoveries : 30
cluster.routing.allocation.node_concurrent_recoveries : 15	

{
        "id" : 36,
        "type" : "EXISTING_STORE",
        "stage" : "DONE",
        "primary" : true,
        "start_time" : "2020-05-26T01:02:29.651Z",
        "start_time_in_millis" : 1590454949651,
        "stop_time" : "2020-05-26T01:07:43.669Z",
        "stop_time_in_millis" : 1590455263669,
        "total_time" : "5.2m",
        "total_time_in_millis" : 314018,
        "source" : {
          "bootstrap_new_history_uuid" : false
        },
        "index" : {
          "size" : {
            "total" : "18.3gb",
            "total_in_bytes" : 19681652796,
            "reused" : "18.3gb",
            "reused_in_bytes" : 19681652796,
            "recovered" : "0b",
            "recovered_in_bytes" : 0,
            "percent" : "100.0%"
          },
          "files" : {
            "total" : 134,
            "reused" : 134,
            "recovered" : 0,
            "percent" : "100.0%"
          },
          "total_time" : "14ms",
          "total_time_in_millis" : 14,
          "source_throttle_time" : "-1",
          "source_throttle_time_in_millis" : 0,
          "target_throttle_time" : "-1",
          "target_throttle_time_in_millis" : 0
        },
        "translog" : {
          "recovered" : 0,
          "total" : 0,
          "percent" : "100.0%",
          "total_on_start" : 0,
          "total_time" : "5.2m",
          "total_time_in_millis" : 312762
        },
        "verify_index" : {
          "check_index_time" : "0s",
          "check_index_time_in_millis" : 0,
          "total_time" : "0s",
          "total_time_in_millis" : 0
        }
      },
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