Custom DateTime Format

I have a template that creates custom mappings for time

curl -XPUT 'http://10.6.98.232:9200/_template/custom_time' -d '
{
"template" : "logstash*",
"mappings": {
"fluentd": {
"properties": {
"time": {
"type": "date",
"format": "yyyy-MM-dd HH:mm:ss,SSS"
}
}
}
}
}
}'

My time format is 2016-04-20 11:06:40,126

Within Kibana, I can see 'time' is coming as 'date' but it is not discovering anything when I use 'time' as 'Time-Field' Name.

Not sure where I am getting it wrong.