Forward Slash in Filter Term [ES 5.6]

When using a forward slash in a term for a filter, I am not getting any documents returned even tho the term is an exact match.

GET datums/datum/_search
  "_source": [
	"query": {
		"bool": { "filter":[
                 {"terms":{"TransportType":["video/zoom"] } }
	"from": 1,
	"size": 10

When the forward slash is removed all documents with TransportType = "video/zoom" are returned. I have tryed to use a backslash or two to escape the caracter with no luck. Any help would be appriciated.

Here is the mapping of the transport type.

"TransportType": {
    "type": "text",
    "fields": {
        "keyword": {
            "type": "keyword",
            "ignore_above": 256

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