Yes, the tag cloud visualization will work on fields that contain arrays of Keywords.
To verify this, I used Kibana dev tools to insert some documents into an index and then created a tag cloud. Dev tools is a great way to quickly experiment with the Elasticsearch API.
PUT example/_doc/1
{
"fieldX" : ["dog", "cat", "fox"]
}
PUT example/_doc/2
{
"fieldX" : ["sheep", "cow", "dog"]
}
PUT example/_doc/3
{
"fieldX" : ["mouse", "dog", "cow"]
}
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