Convert any Elasticsearch response to simple field value format - elasticsearch

Question

On elastic search, when doing a simple query like:
GET miindex-*/mytype/_search
{
"query": {
"query_string": {
"analyze_wildcard": true,
"query": "*"
}
}
}
It returns a format like:
{
"took": 1,
"timed_out": false,
"_shards": {
"total": 1,
"successful": 1,
"failed": 0
},
"hits": {
"total": 28,
"max_score": 1,
"hits": [
...
So I parse like response.hits.hits to get the actual records.
However if you are doing another type of query e.g. aggregation, the response is totally different like:
{
"took": 1,
"timed_out": false,
"_shards": {
"total": 1,
"successful": 1,
"failed": 0
},
"hits": {
"total": 28,
"max_score": 0,
"hits": []
},
"aggregations": {
"myfield": {
"doc_count_error_upper_bound": 0,
"sum_other_doc_count": 0,
"buckets": [
...
and I need to look actually in another json property: response.aggregations.myfield.buckets which gets even more complicated if you have more than one aggregation.
So, my question is very simple, isn't there a way that I can get Elasticsearch to response always with just the fields I want just like in SQL format:
E.g.
SELECT author, bookid FROM books
Would return:
{"author":"rogers", "bookid":099991}
{"author":"peter", "bookid":099992}
SELECT COUNT(author) As count_author, author, count(bookid) As count_bookid, bookid FROM books GROUP BY author, bookid
Would return:
{"count_author":4, "author":"rogers", "count_bookid":9, "bookid":099991}
{"count_author":8, "author":"peter", "count_bookid":9, "bookid":099992}
Is there a way to show only the fields I want and nothing else?(not having to look within nested json objects and all that stuff). (I want this because I'm doing many reports and I want to have a simple function that parses each response easily in a uniform way.)