I have solved with RegEx

GET /my_index/my_type/_search
{
 "_source": false,
 "query": {
   "bool": {
     ...
   }
 },
 "aggs": {
   "group": {
     "nested": {
       "path": "my_path"
     },
     "aggs": {
       "path_id": {
         "terms": {
           "field": "my_path.id",
           "lang": "groovy",
           "script": "def *myVar* = (_value.split('\\\\.').findIndexOf { it 
== '3238175' }+1); *myVar* + '/' + _value; ",
           "include": "*[1-4]*/.*",
           "size": 0
         }
       }
     }
   }
 }
}


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