Elasticsearch: amount of new documents, per type, in the last 24 hours(or timeperiod) -

i tried using following query:

curl -xget 'localhost:9200/<index>/<type>/_search?pretty=true' -d ' {   "size": 0,   "query" : { "range" : { "_timestamp" : { "from" : "1420070400", "to" : "1451606400" }  }  },   "aggs": {     "langs": {       "terms": {         "field": "<field>"       }     }   } } ' 

the from/to detailed here january 1st 2015 till january 1st 2016. result query identical compared not having "query" part in query @ all.

what want achieve document count happens in given timerange, not existing documents of time

the mapping of type i'm working defined this:

"_timestamp" : {     "enabled" : true,     "store" : true,     "format" : "date_time" } 

am doing wrong or working on mistaken assumption?

edit: clarify, i'm looking way see how many documents es has created in last 24 hours, per index, per type. not that, want aggregation on this.

so, let's our type "art" , field i'm aggregating on "type_of_art".

while in total there millions of documents, in last 24 hours there 7 statues, 5 painting , 3 operas got added. instance.

and if wanted know how created between october 1, 2014 , november 15, 2014, imagine exact same query produce result need.

the values dates held in milliseconds, correct query is:

{   "size": 0,   "query" : { "range" : { "_timestamp" : { "from" : "1420070400000", "to" : "1451606400000" }  }  },   "aggs": {     "langs": {       "terms": {         "field": "<field>"       }     }   } }