Hi Vidy,
Yesterday I asked the same question, you can read the answer on the elasticsearch guide,
https://www.elastic.co/guide/en/elasticsearch/reference/current/docs-termvectors.html
Based on that guide, you can retrive the token on document by the following query :
GET /twitter/tweet/1/_termvectors
{
"fields" : ["text"],
"offsets" : true,
"payloads" : true,
"positions" : true,
"term_statistics" : true,
"field_statistics" : true
}
Hope it save your night 