Elasticsearch - using the path hierarchy tokenizer to access different level of categories

Elastic Stack Elasticsearch
1

I'm very new in Elasticsearch and have a question about the hierarchical
tokenizer of a path. Here is my code example:

My mapping code:

PUT /my_index
{
"settings": {
"analysis": {
"analyzer": {
"path-analyzer": {
"type": "custom",
"tokenizer": "path-tokenizer"
}
},
"tokenizer": {
"path-tokenizer": {
"type": "path_hierarchy",
"delimiter": "."
}
}
}
},
"mappings": {
"my_type": {
"dynamic": "strict",
"properties": {
"group_path": {
"type": "string",
"index_analyzer": "path-analyzer",
"search_analyzer": "keyword"
}
}
}
}
}

This is my PUT:

PUT /my_index/my_type/1
{
"group_path": ["Book.Thriller.Adult","DVD.Comedy.Kids"]
}

This is my Query:

GET /my_index/my_type/_search?search_type=count
{
"aggs": {
"category": {
"terms": {
"field": "group_path",
"size": 0
}
}
}
}

And the result:

{
...
"aggregations": {
"category": {
"buckets": [
{
"key": "Book",
"doc_count": 1
},
{
"key": "Book.Thriller",
"doc_count": 1
},
{
"key": "Book.Thriller.Adult",
"doc_count": 1
},
{
"key": "DVD",
"doc_count": 1
},
{
"key": "DVD.Comedy",
"doc_count": 1
},
{
"key": "DVD.Comedy.Kids",
"doc_count": 1
}
]
}
}
}

So far is everything good. What I'm looking for is that how can I create
buckets? for example only for the first category. How can I get result like
that?

{
...
"aggregations": {
"category": {
"buckets": [
{
"key": "Book",
"doc_count": 1
},
{
"key": "DVD",
"doc_count": 1
}
]
}
}
}

Thank you for any help.

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