Fuzziness parameter disables cutoff_frequency in multi_match query

[ben_purdy]

As in the title, setting a value to fuzziness (even 0) will make the multi_match query ignore the cutoff_frequency parameter.

In fact setting fuzziness to 0 and a cutoff_frequency, will return the same results of a multi_match query with neither of them set.

Is this the default behavior or a bug?

I'm trying it on an index with only one shard and elasticsearch 6.2.3

[ben_purdy]

To reproduce:
Setup

{
   "settings":{
      "index":{
         "refresh_interval":"1s",
         "number_of_shards":"1",
         "number_of_replicas":"1"
      }
   },
   "mappings":{
      "generic":{
         "properties":{
            "summary":{
               "type":"text"
            }
         }
      }
   }
}

Add some data in it:

http://localhost:9200/test/generic/1
{
  "summary" :         "The dog"
}

http://localhost:9200/test/generic/2
{
  "summary" :         "The cod"
}

http://localhost:9200/test/generic/3
{
  "summary" :         "The Cutoff Test"
}

Search for something with both cutoff_frequency and fuzziness:

{
   "query":{
            "multi_match":{
            	"cutoff_frequency": 0.001,
               "fuzziness": "0",
               "query":"The bod",
               "fields":[
                  "summary"
               ]
            }
   }
}

For me it is returing everything because it isnt respecting the cutoff_frequency parameter.