How to search documents by version?

Unfortunately, you cannot query or filter by _version - the problem is that that field is not indexed, so queries and filters cannot access it:

http://elasticsearch-users.115913.n3.nabble.com/Can-i-filter-query-by-version-td4044331.html

Try using version

Returns a version for each search hit.

{
    "version": true,
    "query" : {
        "term" : { "user" : "kimchy" }
    }
}

you can search like normal and set version as true and it will return you count of all the versions for each document:

GET indextest/original/_search?pretty=true
{
    "version": true
}