Create arrays based on certain text in a field

Elastic Stack Logstash
6

You could try something like

mutate { add_field => { "tag_cloud_chat" => "%{channel_message}" } }
mutate {
    gsub => [
        "tag_cloud_chat", "\[emote=[^]]*\]", "",
        "tag_cloud_chat", "@\w+", "",
        "tag_cloud_chat", "  ", " "
    ]
}

Removing the extra spaces with a third gsub is just easier than trying to add spaces to the other gsubs and handling corner cases where those spaces do not exist.