Fielddata is disabled on text fields by default error

Fielddata is disabled on text fields by default. Set fielddata=true on [system.network.name] in order to load fielddata in memory by uninverting the inverted index.

elk 6.6.1

how to set fielddata=true on [system.network.name]

i already slove this problem

GET /metricbeat-6.6.1-2019.02.22/_mapping/doc
{
"properties": {
"system.filesystem.mount_point": {
"type": "text",
"fielddata": true
}
}
}

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