sig_terms_query.json

{
  "query": {
    "term": {
      "readmit": 1
    }
  },
  "aggregations": {
    "driver_words": {
      "significant_terms": {
        "field": "TOKENS",
        "size": 100,
        "background_filter": {
          "terms": {
            "readmit": [
              0,
              1
            ]
          }
        }
      }
    }
  },
  "size": 0
}