Too many small segments getting created

Elastic Stack Elasticsearch
3

for most of indices we are seeing this issue. refresh interval set in default mapping which will be applicable to all indices. Please find the index settings applied for a index:

  "index" : {
    "refresh_interval" : "30s",
    "translog" : {
      "sync_interval" : "30s",
      "durability" : "async"
    },
    "auto_expand_replicas" : "false",
    "provided_name" : "log_instance-demo-2020.05.20",
    "creation_date" : "1589932961715",
    "priority" : "100",
    "number_of_replicas" : "0",
    "uuid" : "E1Jyyi-xTKiSH-jyuVCWFQ",
    "version" : {
      "created" : "7040299"
    },
    "lifecycle" : {
      "name" : "log_h_w2_d4"
    },
    "codec" : "best_compression",
    "routing" : {
      "allocation" : {
        "require" : {
          "box_type" : "hot"
        }
      }
    },
    "number_of_shards" : "6"
  }