Newb needs help with date formatting

Elastic Stack Elasticsearch
1

For reasons I cannot understand, I cannot seem to get my date formatting working. Here is the code:
[EDITED]:

PUT /pinggoogle
{
 "mappings" : {
  "logs" : {
   "properties" : {
     "pingdate": {
       "type":"date",
       "format":"yyyy/MM/dd HH:mm:ss"
     }
   }
  }
 }
}
put pinggoogle/logs/1
{
  "pingdate": "2017/07/07 09:05:42"
}

My last command reads the document I am trying to ingest and seems to parse it correctly, but when I look at the index in Kibana, it looks like it brings it in as an unknown type.

2

What is kk? It's not a format we support according to format | Elasticsearch Guide [8.11] | Elastic

3

if I read the documentation correctly it is the hour in 24 hour time. http://www.joda.org/joda-time/apidocs/org/joda/time/format/DateTimeFormat.html

4

... but I get the same error if I change the kk to hh...

5

OK, I edited my code to isolate the problem and changed the kk to hh. My date is still showing up as an unknown type...