Enabling default timestamp in elasticsearch

I want to organize my data in elasticsearch and visualize it using kibana.I
am using elasticsearch 1.4.4 and Kibana3.

The elasticsearch for all my data is bits and I have two document types
aaaa and bbbb. I run the below script at the beginning and expect a
timestamp field of the format yyyy-MM-dd HH:mm:ss with value as the time
of insertion of the document. I can't see this field in kibana. Kibana does
say
mappings._default_._timestamp.enabled however I can't seem to be able to
set that as the index timestamp for my dashboard. What am I doing wrong
here.

curl -XPOST localhost:9200/bits -d '{
"settings" : {
    "number_of_shards" : 2
},
"mappings" : {
    "_default_":{
        "_timestamp" : {
            "enabled" : true,
            "store" : true,
            "path" : "post_date",
            "format" : "yyyy-MM-dd HH:mm:ss"
        }
    }
  }
}'
curl -XPOST localhost:9200/bits/aaaa -d '{
"settings" : {
    "number_of_shards" : 2
},
"mappings" : {
    "_default_":{
        "_timestamp" : {
            "enabled" : true,
            "store" : true,
             "path" : "post_date",
            "format" : "yyyy-MM-dd HH:mm:ss"
        }
    }
  }
}'
curl -XPOST localhost:9200/bits/bbbb -d '{
"settings" : {
    "number_of_shards" : 2
},
"mappings" : {
    "_default_":{
        "_timestamp" : {
            "enabled" : true,
            "store" : true,
               "path" : "post_date",
            "format" : "yyyy-MM-dd HH:mm:ss"
        }
    }
  }
}'

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