Elastic aggregation search result filters

Elastic Stack Elasticsearch
1

Hello everyone
We have index mapping like that:

{
	"test2": {
		"mappings": {
			"products": {
				"properties": {
					"category": {
						"properties": {
							"id": {
								"type": "long"
							},
							"name": {
								"type": "text",
								"fields": {
									"keyword": {
										"type": "keyword",
										"ignore_above": 256
									}
								}
							}
						}
					},
					"category_char": {
						"properties": {
							"2": {
								"properties": {
									"characteristic_name": {
										"type": "text",
										"fields": {
											"keyword": {
												"type": "keyword",
												"ignore_above": 256
											}
										}
									},
									"data_type": {
										"type": "text",
										"fields": {
											"keyword": {
												"type": "keyword",
												"ignore_above": 256
											}
										}
									},
									"filter": {
										"type": "long"
									},
									"id": {
										"type": "long"
									},
									"unit": {
										"type": "text",
										"fields": {
											"keyword": {
												"type": "keyword",
												"ignore_above": 256
											}
										}
									}
								}
							},
							"characteristic_name": {
								"type": "text",
								"fields": {
									"keyword": {
										"type": "keyword",
										"ignore_above": 256
									}
								}
							},
							"data_type": {
								"type": "text",
								"fields": {
									"keyword": {
										"type": "keyword",
										"ignore_above": 256
									}
								}
							},
							"filter": {
								"type": "long"
							},
							"id": {
								"type": "long"
							},
							"unit": {
								"type": "text",
								"fields": {
									"keyword": {
										"type": "keyword",
										"ignore_above": 256
									}
								}
							}
						}
					},
					"category_id": {
						"type": "long"
					},
					"created_at": {
						"type": "text",
						"fields": {
							"keyword": {
								"type": "keyword",
								"ignore_above": 256
							}
						}
					},
					"description": {
						"type": "text",
						"fields": {
							"keyword": {
								"type": "keyword",
								"ignore_above": 256
							}
						}
					},
					"id": {
						"type": "long"
					},
					"product_char": {
						"properties": {
							"char_id": {
								"type": "long"
							},
							"data_type": {
								"type": "text",
								"fields": {
									"keyword": {
										"type": "keyword",
										"ignore_above": 256
									}
								}
							},
							"filter": {
								"type": "long"
							},
							"product_id": {
								"type": "long"
							},
							"unit": {
								"type": "text",
								"fields": {
									"keyword": {
										"type": "keyword",
										"ignore_above": 256
									}
								}
							},
							"value": {
								"type": "text",
								"fields": {
									"keyword": {
										"type": "keyword",
										"ignore_above": 256
									}
								},
								"fielddata": true
							}
						}
					},
					"title": {
						"type": "text",
						"fields": {
							"keyword": {
								"type": "keyword",
								"ignore_above": 256
							}
						},
						"fielddata": true
					},
					"value": {
						"type": "text",
						"fielddata": true
					}
				}
			}
		}
	}
}

then I do query like that:

{
   "query":{
       "multi_match":{
           "query": "Samsung",
           "fuzziness": "AUTO",
           "fields": ["title^2", "tags^3", "description"]
       }
   },
   "aggs": {
       "categories": {
           "terms" : {
               "field": "category_id"
           },
           "aggs": {
               "characteristics" :{
                   "terms" :{
                       "field": "product_char.char_id",
                       "size": 100000
                   },
                   "aggs" :{
                       "value": {
                           "terms" :{
                               "field" : "product_char.value.keyword",
                               "size" : 100000
                           }
                       }
                   }
               }
           }
       }
   }
}

My question is, why I get clones of characteristics value in each characteristic in response?

My goal is get uniq characteristics and aggregate uniq values of each characteristic of all products I got from my query.
I need it to make search results filters on my site.

Thanks for any help...

2

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