Please follow the below steps:

1) Log in to the Helix Logging Kibana UI and create the index data view as described in the Viewing Logs on Kibana section of the documentation.

2) Click on the three bars at the top left of the screen and scroll down to select the Dev Tools menu option.



3) Paste the JSON below into the Console changing the 7d value if you want to retain something other than 7 days of indices:

PUT _ilm/policy/BMC_logstash_cleanup
{
  "policy": {
    "phases": {
      "hot": {
        "actions": {
          "set_priority": {
            "priority": 100
          }
        },
        "min_age": "0ms"
      },
      "delete": {
        "min_age": "7d",
        "actions": {
          "delete": {}
        }
      }
    }
  }
}

4) Click on the first line and then the play icon that is displayed at the end of the line to create the policy:



5) Repeat the process using the JSON below to create an index template:

PUT _index_template/logstash_index_template
{
  "index_patterns": ["logstash-*"], 
  "template": {
    "settings": {
      "index.lifecycle.name": "BMC_logstash_cleanup", 
      "index.lifecycle.rollover_alias": "logstash_ilm" 
    }
  }
}

and again to apply the template to existing logstash-* indices:

PUT logstash-*/_settings 
{
  "index": {
    "lifecycle": {
      "name": "BMC_logstash_cleanup"
    }
  }
}

6) To verify that the policy is in place again click on the three bars and select Stack Management -> Index Management to list your current indices.  Click on one of the logstash-* items and the index details, including the active lifecycle management policy, will be displayed:



Note: If a user having different indices name, then please replace the indices name accordingly:

For example, indices named "logstash-*"):

PUT _ilm/policy/BMC_logstash_cleanup
{
  "policy": {
    "phases": {
      "hot": {
        "actions": {
          "set_priority": {
            "priority": 100
          }
        },
        "min_age": "0ms"
      },
      "delete": {
        "min_age": "7d",
        "actions": {
          "delete": {}
        }
      }
    }
  }
}


PUT _index_template/logstash_index_template
{
  "index_patterns": ["helix-*"], 
  "template": {
    "settings": {
      "index.lifecycle.name": "BMC_logstash_cleanup", 
      "index.lifecycle.rollover_alias": "logstash_ilm" 
    }
  }
}

PUT helix-*/_settings 
{
  "index": {
    "lifecycle": {
      "name": "BMC_logstash_cleanup"
    }
  }
}