Search query in Kibana returning results but the same query in Node.js returns null hits

Question

I have a search query for elastic which returns correct results when I run it in Kibana

{ "_source": ["name", "geotag"],
  "query": {
    "terms": {
      "geotag": ["east", "central"]
    }
  },
  "post_filter": {
    "terms": {
      "name": ["toronto", "seneca", "carleton"]
    }
  }
}

This above query works perfectly fine and returns the results in kibana

But when I try to run it in node.js it returns null hits. When I remove the post_filter from the query then it's working but I need the post_filter in node.js

const searchQuery = {
        _source: ['_id', 'comments', '_parent', 'name', 'geotag'],
        query: {
          terms: {
            geotag: body.locations,
          },
        },
        post_filter: {
          terms: {
            name: body.rankings,
          },
        },
      };
      try {
        let search = await client.search({
          index: 'universities',
          body: searchQuery,
        });
        let resolvedPromise = await Promise.all([search]);
        console.log(resolvedPromise[0]);
        return resolvedPromise[0];
      } catch (err) {
        console.log(err);
        return setResponse(err.statusCode, {
          message: err.message,
        });

It's returning the following response in node.js

    "body": {
        "took": 0,
        "timed_out": false,
        "_shards": {
            "total": 1,
            "successful": 1,
            "skipped": 0,
            "failed": 0
        },
        "hits": {
            "total": 0,
            "max_score": null,
            "hits": []
        }
    },