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postfilter_elasticsearch中的post_filter
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查询state为MD的数据，并且根据查询后的结果，以城市city聚合，显示查询结果和聚合结果：
查询1：
POST /bank/_search
{
"size": 30,
"query": {
"bool": {
"filter": {
"term": {
"state.keyword": "MD"
}
}
}
},
"aggs": {
"cities": {
"terms": {
"size": 30,
"field": "city.keyword"
}
}
}
}
查询结果如下：
结果1：
{
"took" : 7,
"timed_out" : false,
"_shards" : {
"total" : 1,
"successful" : 1,
"skipped" : 0,
"failed" : 0
},
"hits" : {
"total" : {
"value" : 28,
"relation" : "eq"
},
"max_score" : 0.0,
"hits" : [
{
"_index" : "bank",
"_type" : "_doc",
"_id" : "18",
"_score" : 0.0,
"_source" : {
"account_number" : 18,
"balance" : 4180,
"firstname" : "Dale",
"lastname" : "Adams",
"age" : 33,
"gender" : "M",
"address" : "467 Hutchinson Court",
"employer" : "Boink",
"email" : "daleadams@boink.com",
"city" : "Orick",
"state" : "MD"
}
},
{
"_index" : "bank",
"_type" : "_doc",
"_id" : "126",
"_score" : 0.0,
"_source" : {
"account_number" : 126,
"balance" : 3607,
"firstname" : "Effie",
"lastname" : "Gates",
"age" : 39,
"gender" : "F",
"address" : "620 National Drive",
"employer" : "Digitalus",
"email" : "effiegates@digitalus.com",
"city" : "Blodgett",
"state" : "MD"
}
},
{
"_index" : "bank",
"_type" : "_doc",
"_id" : "157",
"_score" : 0.0,
"_source" : {
"account_number" : 157,
"balance" : 39868,
"firstname" : "Claudia",
"lastname" : "Terry",
"age" : 20,
"gender" : "F",
"address" : "132 Gunnison Court",
"employer" : "Lumbrex",
"email" : "claudiaterry@lumbrex.com",
"city" : "Castleton",
"state" : "MD"
}
},
{
"_index" : "bank",
"_type" : "_doc",
"_id" : "253",
"_score" : 0.0,
"_source" : {
"account_number" : 253,
"balance" : 20240,
"firstname" : "Melissa",
"lastname" : "Gould",
"age" : 31,
"gender" : "M",
"address" : "440 Fuller Place",
"employer" : "Buzzopia",
"email" : "melissagould@buzzopia.com",
"city" : "Lumberton",
"state" : "MD"
}
},
{
"_index" : "bank",
"_type" : "_doc",
"_id" : "323",
"_score" : 0.0,
"_source" : {
"account_number" : 323,
"balance" : 42230,
"firstname" : "Chelsea",
"lastname" : "Gamble",
"age" : 34,
"gender" : "F",
"address" : "356 Dare Court",
"employer" : "Isosphere",
"email" : "chelseagamble@isosphere.com",
"city" : "Dundee",
"state" : "MD"
}
},
{
"_index" : "bank",
"_type" : "_doc",
"_id" : "556",
"_score" : 0.0,
"_source" : {
"account_number" : 556,
"balance" : 36420,
"firstname" : "Collier",
"lastname" : "Odonnell",
"age" : 35,
"gender" : "M",
"address" : "591 Nolans Lane",
"employer" : "Sultraxin",
"email" : "collierodonnell@sultraxin.com",
"city" : "Fulford",
"state" : "MD"
}
},
{
"_index" : "bank",
"_type" : "_doc",
"_id" : "575",
"_score" : 0.0,
"_source" : {
"account_number" : 575,
"balance" : 12588,
"firstname" : "Buchanan",
"lastname" : "Pope",
"age" : 39,
"gender" : "M",
"address" : "581 Sumner Place",
"employer" : "Stucco",
"email" : "buchananpope@stucco.com",
"city" : "Ellerslie",
"state" : "MD"
}
},
{
"_index" : "bank",
"_type" : "_doc",
"_id" : "266",
"_score" : 0.0,
"_source" : {
"account_number" : 266,
"balance" : 2777,
"firstname" : "Monique",
"lastname" : "Conner",
"age" : 35,
"gender" : "F",
"address" : "489 Metrotech Courtr",
"employer" : "Flotonic",
"email" : "moniqueconner@flotonic.com",
"city" : "Retsof",
"state" : "MD"
}
},
{
"_index" : "bank",
"_type" : "_doc",
"_id" : "913",
"_score" : 0.0,
"_source" : {
"account_number" : 913,
"balance" : 47657,
"firstname" : "Margery",
"lastname" : "Monroe",
"age" : 25,
"gender" : "M",
"address" : "941 Fanchon Place",
"employer" : "Exerta",
"email" : "margerymonroe@exerta.com",
"city" : "Bannock",
"state" : "MD"
}
},
{
"_index" : "bank",
"_type" : "_doc",
"_id" : "268",
"_score" : 0.0,
"_source" : {
"account_number" : 268,
"balance" : 20925,
"firstname" : "Avis",
"lastname" : "Blackwell",
"age" : 36,
"gender" : "M",
"address" : "569 Jerome Avenue",
"employer" : "Magnina",
"email" : "avisblackwell@magnina.com",
"city" : "Bethany",
"state" : "MD"
}
},
{
"_index" : "bank",
"_type" : "_doc",
"_id" : "326",
"_score" : 0.0,
"_source" : {
"account_number" : 326,
"balance" : 9692,
"firstname" : "Pearl",
"lastname" : "Reese",
"age" : 30,
"gender" : "F",
"address" : "451 Colonial Court",
"employer" : "Accruex",
"email" : "pearlreese@accruex.com",
"city" : "Westmoreland",
"state" : "MD"
}
},
{
"_index" : "bank",
"_type" : "_doc",
"_id" : "338",
"_score" : 0.0,
"_source" : {
"account_number" : 338,
"balance" : 6969,
"firstname" : "Pierce",
"lastname" : "Lawrence",
"age" : 35,
"gender" : "M",
"address" : "318 Gallatin Place",
"employer" : "Lunchpad",
"email" : "piercelawrence@lunchpad.com",
"city" : "Iola",
"state" : "MD"
}
},
{
"_index" : "bank",
"_type" : "_doc",
"_id" : "617",
"_score" : 0.0,
"_source" : {
"account_number" : 617,
"balance" : 35445,
"firstname" : "Kitty",
"lastname" : "Cooley",
"age" : 22,
"gender" : "M",
"address" : "788 Seagate Avenue",
"employer" : "Ultrimax",
"email" : "kittycooley@ultrimax.com",
"city" : "Clarktown",
"state" : "MD"
}
},
{
"_index" : "bank",
"_type" : "_doc",
"_id" : "662",
"_score" : 0.0,
"_source" : {
"account_number" : 662,
"balance" : 10138,
"firstname" : "Daisy",
"lastname" : "Burnett",
"age" : 33,
"gender" : "M",
"address" : "114 Norman Avenue",
"employer" : "Liquicom",
"email" : "daisyburnett@liquicom.com",
"city" : "Grahamtown",
"state" : "MD"
}
},
{
"_index" : "bank",
"_type" : "_doc",
"_id" : "939",
"_score" : 0.0,
"_source" : {
"account_number" : 939,
"balance" : 31228,
"firstname" : "Hodges",
"lastname" : "Massey",
"age" : 37,
"gender" : "F",
"address" : "431 Dahl Court",
"employer" : "Kegular",
"email" : "hodgesmassey@kegular.com",
"city" : "Katonah",
"state" : "MD"
}
},
{
"_index" : "bank",
"_type" : "_doc",
"_id" : "965",
"_score" : 0.0,
"_source" : {
"account_number" : 965,
"balance" : 21882,
"firstname" : "Patrica",
"lastname" : "Melton",
"age" : 28,
"gender" : "M",
"address" : "141 Rodney Street",
"employer" : "Flexigen",
"email" : "patricamelton@flexigen.com",
"city" : "Klagetoh",
"state" : "MD"
}
},
{
"_index" : "bank",
"_type" : "_doc",
"_id" : "977",
"_score" : 0.0,
"_source" : {
"account_number" : 977,
"balance" : 6744,
"firstname" : "Rodgers",
"lastname" : "Mccray",
"age" : 21,
"gender" : "F",
"address" : "612 Duryea Place",
"employer" : "Papricut",
"email" : "rodgersmccray@papricut.com",
"city" : "Marenisco",
"state" : "MD"
}
},
{
"_index" : "bank",
"_type" : "_doc",
"_id" : "454",
"_score" : 0.0,
"_source" : {
"account_number" : 454,
"balance" : 31687,
"firstname" : "Alicia",
"lastname" : "Rollins",
"age" : 22,
"gender" : "F",
"address" : "483 Verona Place",
"employer" : "Boilcat",
"email" : "aliciarollins@boilcat.com",
"city" : "Lutsen",
"state" : "MD"
}
},
{
"_index" : "bank",
"_type" : "_doc",
"_id" : "543",
"_score" : 0.0,
"_source" : {
"account_number" : 543,
"balance" : 48022,
"firstname" : "Marina",
"lastname" : "Rasmussen",
"age" : 31,
"gender" : "M",
"address" : "446 Love Lane",
"employer" : "Crustatia",
"email" : "marinarasmussen@crustatia.com",
"city" : "Statenville",
"state" : "MD"
}
},
{
"_index" : "bank",
"_type" : "_doc",
"_id" : "644",
"_score" : 0.0,
"_source" : {
"account_number" : 644,
"balance" : 44021,
"firstname" : "Etta",
"lastname" : "Miller",
"age" : 21,
"gender" : "F",
"address" : "376 Lawton Street",
"employer" : "Bluegrain",
"email" : "ettamiller@bluegrain.com",
"city" : "Baker",
"state" : "MD"
}
},
{
"_index" : "bank",
"_type" : "_doc",
"_id" : "675",
"_score" : 0.0,
"_source" : {
"account_number" : 675,
"balance" : 36102,
"firstname" : "Fisher",
"lastname" : "Shepard",
"age" : 27,
"gender" : "F",
"address" : "859 Varick Street",
"employer" : "Qot",
"email" : "fishershepard@qot.com",
"city" : "Diaperville",
"state" : "MD"
}
},
{
"_index" : "bank",
"_type" : "_doc",
"_id" : "930",
"_score" : 0.0,
"_source" : {
"account_number" : 930,
"balance" : 47257,
"firstname" : "Kinney",
"lastname" : "Lawson",
"age" : 39,
"gender" : "M",
"address" : "501 Raleigh Place",
"employer" : "Neptide",
"email" : "kinneylawson@neptide.com",
"city" : "Deltaville",
"state" : "MD"
}
},
{
"_index" : "bank",
"_type" : "_doc",
"_id" : "954",
"_score" : 0.0,
"_source" : {
"account_number" : 954,
"balance" : 49404,
"firstname" : "Jenna",
"lastname" : "Martin",
"age" : 22,
"gender" : "M",
"address" : "688 Hart Street",
"employer" : "Zinca",
"email" : "jennamartin@zinca.com",
"city" : "Oasis",
"state" : "MD"
}
},
{
"_index" : "bank",
"_type" : "_doc",
"_id" : "200",
"_score" : 0.0,
"_source" : {
"account_number" : 200,
"balance" : 26210,
"firstname" : "Teri",
"lastname" : "Hester",
"age" : 39,
"gender" : "M",
"address" : "653 Abbey Court",
"employer" : "Electonic",
"email" : "terihester@electonic.com",
"city" : "Martell",
"state" : "MD"
}
},
{
"_index" : "bank",
"_type" : "_doc",
"_id" : "255",
"_score" : 0.0,
"_source" : {
"account_number" : 255,
"balance" : 49339,
"firstname" : "Iva",
"lastname" : "Rivers",
"age" : 38,
"gender" : "M",
"address" : "470 Rost Place",
"employer" : "Mantrix",
"email" : "ivarivers@mantrix.com",
"city" : "Disautel",
"state" : "MD"
}
},
{
"_index" : "bank",
"_type" : "_doc",
"_id" : "527",
"_score" : 0.0,
"_source" : {
"account_number" : 527,
"balance" : 2028,
"firstname" : "Carver",
"lastname" : "Peters",
"age" : 35,
"gender" : "M",
"address" : "816 Victor Road",
"employer" : "Housedown",
"email" : "carverpeters@housedown.com",
"city" : "Nadine",
"state" : "MD"
}
},
{
"_index" : "bank",
"_type" : "_doc",
"_id" : "818",
"_score" : 0.0,
"_source" : {
"account_number" : 818,
"balance" : 24433,
"firstname" : "Espinoza",
"lastname" : "Petersen",
"age" : 26,
"gender" : "M",
"address" : "641 Glenwood Road",
"employer" : "Futurity",
"email" : "espinozapetersen@futurity.com",
"city" : "Floriston",
"state" : "MD"
}
},
{
"_index" : "bank",
"_type" : "_doc",
"_id" : "952",
"_score" : 0.0,
"_source" : {
"account_number" : 952,
"balance" : 21430,
"firstname" : "Angelique",
"lastname" : "Weeks",
"age" : 33,
"gender" : "M",
"address" : "659 Reeve Place",
"employer" : "Exodoc",
"email" : "angeliqueweeks@exodoc.com",
"city" : "Turpin",
"state" : "MD"
}
}
]
},
"aggregations" : {
"cities" : {
"doc_count_error_upper_bound" : 0,
"sum_other_doc_count" : 0,
"buckets" : [
{
"key" : "Baker",
"doc_count" : 1
},
{
"key" : "Bannock",
"doc_count" : 1
},
{
"key" : "Bethany",
"doc_count" : 1
},
{
"key" : "Blodgett",
"doc_count" : 1
},
{
"key" : "Castleton",
"doc_count" : 1
},
{
"key" : "Clarktown",
"doc_count" : 1
},
{
"key" : "Deltaville",
"doc_count" : 1
},
{
"key" : "Diaperville",
"doc_count" : 1
},
{
"key" : "Disautel",
"doc_count" : 1
},
{
"key" : "Dundee",
"doc_count" : 1
},
{
"key" : "Ellerslie",
"doc_count" : 1
},
{
"key" : "Floriston",
"doc_count" : 1
},
{
"key" : "Fulford",
"doc_count" : 1
},
{
"key" : "Grahamtown",
"doc_count" : 1
},
{
"key" : "Iola",
"doc_count" : 1
},
{
"key" : "Katonah",
"doc_count" : 1
},
{
"key" : "Klagetoh",
"doc_count" : 1
},
{
"key" : "Lumberton",
"doc_count" : 1
},
{
"key" : "Lutsen",
"doc_count" : 1
},
{
"key" : "Marenisco",
"doc_count" : 1
},
{
"key" : "Martell",
"doc_count" : 1
},
{
"key" : "Nadine",
"doc_count" : 1
},
{
"key" : "Oasis",
"doc_count" : 1
},
{
"key" : "Orick",
"doc_count" : 1
},
{
"key" : "Retsof",
"doc_count" : 1
},
{
"key" : "Statenville",
"doc_count" : 1
},
{
"key" : "Turpin",
"doc_count" : 1
},
{
"key" : "Westmoreland",
"doc_count" : 1
}
]
}
}
}
接下来增加post_filter，进行第二次查询
查询2：
POST /bank/_search
{
"size": 30,
"query": {
"bool": {
"filter": {
"term": {
"state.keyword": "MD"
}
}
}
},
"aggs": {
"cities": {
"terms": {
"size": 30,
"field": "city.keyword"
}
}
},
"post_filter": {
"term": {
"city.keyword": "Ellerslie"
}
}
}
查询结果
结果2：
{
"took" : 4,
"timed_out" : false,
"_shards" : {
"total" : 1,
"successful" : 1,
"skipped" : 0,
"failed" : 0
},
"hits" : {
"total" : {
"value" : 1,
"relation" : "eq"
},
"max_score" : 0.0,
"hits" : [
{
"_index" : "bank",
"_type" : "_doc",
"_id" : "575",
"_score" : 0.0,
"_source" : {
"account_number" : 575,
"balance" : 12588,
"firstname" : "Buchanan",
"lastname" : "Pope",
"age" : 39,
"gender" : "M",
"address" : "581 Sumner Place",
"employer" : "Stucco",
"email" : "buchananpope@stucco.com",
"city" : "Ellerslie",
"state" : "MD"
}
}
]
},
"aggregations" : {
"cities" : {
"doc_count_error_upper_bound" : 0,
"sum_other_doc_count" : 0,
"buckets" : [
{
"key" : "Baker",
"doc_count" : 1
},
{
"key" : "Bannock",
"doc_count" : 1
},
{
"key" : "Bethany",
"doc_count" : 1
},
{
"key" : "Blodgett",
"doc_count" : 1
},
{
"key" : "Castleton",
"doc_count" : 1
},
{
"key" : "Clarktown",
"doc_count" : 1
},
{
"key" : "Deltaville",
"doc_count" : 1
},
{
"key" : "Diaperville",
"doc_count" : 1
},
{
"key" : "Disautel",
"doc_count" : 1
},
{
"key" : "Dundee",
"doc_count" : 1
},
{
"key" : "Ellerslie",
"doc_count" : 1
},
{
"key" : "Floriston",
"doc_count" : 1
},
{
"key" : "Fulford",
"doc_count" : 1
},
{
"key" : "Grahamtown",
"doc_count" : 1
},
{
"key" : "Iola",
"doc_count" : 1
},
{
"key" : "Katonah",
"doc_count" : 1
},
{
"key" : "Klagetoh",
"doc_count" : 1
},
{
"key" : "Lumberton",
"doc_count" : 1
},
{
"key" : "Lutsen",
"doc_count" : 1
},
{
"key" : "Marenisco",
"doc_count" : 1
},
{
"key" : "Martell",
"doc_count" : 1
},
{
"key" : "Nadine",
"doc_count" : 1
},
{
"key" : "Oasis",
"doc_count" : 1
},
{
"key" : "Orick",
"doc_count" : 1
},
{
"key" : "Retsof",
"doc_count" : 1
},
{
"key" : "Statenville",
"doc_count" : 1
},
{
"key" : "Turpin",
"doc_count" : 1
},
{
"key" : "Westmoreland",
"doc_count" : 1
}
]
}
}
}
很明显，查询1与查询2的不同在于，查询2比查询1多了如下代码：
"post_filter": {
"term": {
"city.keyword": "Ellerslie"
}
}
导致的结果是，查询1出现在hits中的结果有28条，而查询2出现在hits中的结果只有1条，对比两个查询实例，我们可以了解到：
查询1的查询结果只经过一次过滤(根据state.keyword = "MD"过滤)，而查询2的查询结果，经过了两次过滤(post_filter贡献了第二次过滤)。但是两次查询后的聚合结果都没有发生变化。也就是说，查询2中的第一次查询后的结果，可以用于聚合，生成聚合结果后，我们可以根据相应的需求(如：city.keyword = "Ellerslie")，对一次查询得到的结果用post_filter进行二次过滤。
