How to change the default type of MetricBeat index when ingest data to ES

Hello, everyone.

I added 2 custom fields in "metricbeat.yml" like following:

fields: {xaxis: 1, yaxis: 1}

After data store in ES, those 2 fields are defined as "String" type in the mapping definition:

"fields": {
"path_match": "fields.*",
"match_mapping_type": "string",
"mapping": {
"type": "keyword"

So, may I know if there is a configuration item to let me modify the type from "String" to "Long" for custom fields?

Thanks in advance!

There is a "hidden" setting callend append_fields that you can use for that:

It has the same structure as the fields.yml we use inside our repository.

For your case it would be:

- name: fields.xaxis
  type: log

If you change anything here, you must overwrite your existing template and it will only apply to new indices.

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