Filter empty terms buckets after aggregation

Elastic Stack Elasticsearch
1

I am trying to run a query which returns only network device and interface which have specific utilization.
I am using bucket_selector to filter out value aggregations which does not meat criteria and it almost gives me what I want, but terms (keys) are still returned with empty buckets see output below:

Aggregation:

"aggs": {
	"DBF_Device": {
		"terms": {
			"field": "tag.agent_host",
			"size": 1000,
			"order": {
				"_term": "desc"
			}
		},
		"aggs": {
			"DBF_Interface": {
				"terms": {
					"field": "tag.ifDescr",
					"size": 1000,
					"order": {
						"_term": "desc"
					}
				},
				"aggs": {
					"DBF_Metric": {
						"date_histogram": {
							"interval": "5m",
							"field": "@timestamp"
						},
						"aggs": {
							"DBF_Speed": {
								"max": {
									"field": "interface.ifHighSpeed",
									"script": {
										"inline": "_value*1000000"
									}
								}
							},
							"DBF_Metric_AVG": {
								"avg": {
									"field": "interface.ifHCInOctets",
									"script": {
										"inline": "(_value*8)/300"
									}
								}
							},
							"DBF_Metric_DER": {
								"derivative": {
									"buckets_path": "DBF_Metric_AVG"
								}
							},
							"DBF_Metric_Percent": {
								"bucket_script": {
									"buckets_path": {
										"my_var1": "DBF_Metric_DER",
										"my_var2": "DBF_Speed"
									},
									"script": "(params.my_var1 * 100)/ params.my_var2"
								}
							},
							"DBF_Bucket_filter": {
								"bucket_selector": {
									"buckets_path": {
										"my_var3": "DBF_Metric_Percent"
									},
									"script": "10 < (params.my_var3 ?: 0) && (params.my_var3 ?: 0)< 100"
								}
							}
						}
					}
				}
			}
		}
	}
}

Output:

            {
                "key": "ROUTER-1.domain.net",
                "doc_count": 28,
                "DBF_Interface": {
                    "doc_count_error_upper_bound": 0,
                    "sum_other_doc_count": 0,
                    "buckets": [
                        {
                            "key": "TenGigabitEthernet1/1/4",
                            "doc_count": 14,
                            "DBF_Metric": {
                                "buckets": []
                            }
                        },
                        {
                            "key": "TenGigabitEthernet1/1/3",
                            "doc_count": 14,
                            "DBF_Metric": {
                                "buckets": []
                            }
                        }
                    ]
                }
            },
            {
                "key": "ROUTER-2.domain.net",
                "doc_count": 42,
                "DBF_Interface": {
                    "doc_count_error_upper_bound": 0,
                    "sum_other_doc_count": 0,
                    "buckets": [
                        {
                            "key": "GigabitEthernet0/0/2",
                            "doc_count": 14,
                            "DBF_Metric": {
                                "buckets": []
                            }
                        },
                        {
                            "key": "GigabitEthernet0/0/1",
                            "doc_count": 14,
                            "DBF_Metric": {
                                "buckets": []
                            }
                        },
                        {
                            "key": "GigabitEthernet0/0/0",
                            "doc_count": 14,
                            "DBF_Metric": {
                                "buckets": [
                                    {
                                        "key_as_string": "2018-04-04T13:55:00.000Z",
                                        "key": 1522850100000,
                                        "doc_count": 10,
                                        "DBF_Speed": {
                                            "value": 100000000
                                        },
                                        "DBF_Metric_AVG": {
                                            "value": 16481198003.642666
                                        },
                                        "DBF_Metric_DER": {
                                            "value": 19436389.002666473
                                        },
                                        "DBF_Metric_Percent": {
                                            "value": 19.436389002666473
                                        }
                                    }
                                ]
                            }
                        }
                    ]
                }
            },

From the output you can see that only ROUTER-2.domain.net GigabitEthernet0/0/0 meets criteria in bucket_selector and DBF_Metrics aggregation values are returned, which is good.
But other interfaces on same device does not meet criteria and all interfaces on ROUTER-1.domain.net also does not meat criteria but they are still listed but with empty DBF_Metrics bucket.

Any idea how can I also filter out terms buckets which have metrics aggregation buckets empty?

2

Did you try using min_doc_count. Please refer documentation

3

Yes, I had a thought about it but, doc count matters before aggregations as it works on "raw" data, and as you can see in my output above for for empty terms buckets: "doc_count": 14.
I need something that could filter based on aggregation results- buckets.

4

Sorry, I missed that..
How about this thread. See if this is helpful

5

Yes I saw that also before and tried it out, but it does not seem to work. As in example I have added additional bucket_selector (MIN_BUCKET_SELECTOR) at the same level as the previous one:

							"DBF_Bucket_filter": {
								"bucket_selector": {
									"buckets_path": {
										"my_var3": "DBF_Metric_Percent"
									},
									"script": "10 < (params.my_var3 ?: 0) && (params.my_var3 ?: 0)< 100"
								}
							},
							"MIN_BUCKET_SELECTOR": {
								"bucket_selector": {
									"buckets_path": {
										"count": "DBF_Metric._bucket_count"
									},
									"script": {
										"inline": "params.count != 0"
									}
								}
							}

But I get error:

{
    "took": 341,
    "timed_out": false,
    "_shards": {
        "total": 940,
        "successful": 912,
        "skipped": 912,
        "failed": 28,
        "failures": [
            {
                "shard": 0,
                "index": "test-index--2018.04.04",
                "node": "lGIeqEb9SPeqBB32oBHL_g",
                "reason": {
                    "type": "illegal_argument_exception",
                    "reason": "No aggregation found for path [DBF_Interface._bucket_count]"
                }
            }
        ]
    },
    "hits": {
        "total": 0,
        "max_score": 0,
        "hits": []
    }
}

There are to possibilities why it is not working:
either I make addressing of variable wrong
or
it is not suppose to work because bucket_selector only filters withing aggregation it is placed in, and DBF_Metric and DBF_Interface are higher level aggregations and is not affected by aggregations done in their child agregations.