elasticsearch - Nested Object in Kibana visualize -

i have uploaded json file in elasticsearch , mapping contains of nested objects.

the problem that, in kibana, in visualize can not see them

this mapping:

"comments": {     "type": "nested",     "properties": {         "count": {             "type": "integer"         },         "data": {             "type":"nested",             "properties": {                 "created_time": {                     "type": "integer"                 }             }         }     } } 

but in kibana when insert comments.count cannot see result, in discover page, comments.count field exist!

how can search field?

as found, kibana can not deal nested or parent/child