es – elasticsearch search – collapse

There is no such thing as a perfect program, but that doesn’t discourage us, because writing a program is a constant pursuit of perfection.

Q: What are the features of collapse?

A:



– How will collapse be used?

A:

# collapse
PUT /collapse_test
{
  "mappings" : {
    "properties" : {
      "name" : {"type" : "text"},
      "user" : {
        "properties": { 
          "id"  : {"type" : "integer"},
          "age" : {"type" : "integer"}}}}}} # index POST /collapse_test/_doc/1
{
  "name" : "hello"."user" : {
    "id"  : 1."age" : 18}} # index POST /collapse_test/_doc/2
{
  "name" : "hello good"."user" : {
    "id"  : 2."age" : 17}} # index POST /collapse_test/_doc/3
{
  "name" : "hello good"."user" : {
    "id"  : 3."age" : 17}} # index POST /collapse_test/_doc/4
{
  "name" : "hello good"."user" : {
    "id"  : 4."age" : 17}} # index POST /collapse_test/_doc/5
{
  "name" : "hello good me"."user" : {
    "id"  : 5."age" : 19}} # Collapse_test /_search {"query" : {
    "match" : {
      "name" : "hello"}},"collapse" : {
    "field" : "user.id"}} # result {"took" : 0."timed_out" : false."_shards" : {
    "total" : 1."successful" : 1."skipped" : 0."failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 5."relation" : "eq"
    },
    "max_score" : null."hits": [{"_index" : "collapse_test"."_type" : "_doc"."_id" : "1"."_score" : 0.10938574."_source" : {
          "name" : "hello"."user" : {
            "id" : 1."age" : 18}},"fields" : {
          "user.id" : [
            1]}}, {"_index" : "collapse_test"."_type" : "_doc"."_id" : "2"."_score" : 0.08701137."_source" : {
          "name" : "hello good"."user" : {
            "id" : 2."age" : 17}},"fields" : {
          "user.id" : [
            2]}}, {"_index" : "collapse_test"."_type" : "_doc"."_id" : "3"."_score" : 0.08701137."_source" : {
          "name" : "hello good"."user" : {
            "id" : 3."age" : 17}},"fields" : {
          "user.id" : [
            3]}}, {"_index" : "collapse_test"."_type" : "_doc"."_id" : "4"."_score" : 0.08701137."_source" : {
          "name" : "hello good"."user" : {
            "id" : 4."age" : 17}},"fields" : {
          "user.id" : [
            4]}}, {"_index" : "collapse_test"."_type" : "_doc"."_id" : "5"."_score" : 0.07223585."_source" : {
          "name" : "hello good me"."user" : {
            "id" : 5."age" : 19}},"fields" : {
          "user.id" : [
            5# Collapse_test /_search {"collapse" : {
    "field"      : "user.age"."inner_hits": [{"name" : "most_recent"."size" : 4."sort" : [{"user.id" : "desc"}]}, {"name" : "largest_responses"."size" : 4."sort" : [{"user.id" : "asc"}}]]."max_concurrent_group_searches" : 4
   },
   "sort" : [{"user.id" : "desc"}}"took" : 0."timed_out" : false."_shards" : {
    "total" : 1."successful" : 1."skipped" : 0."failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 5."relation" : "eq"
    },
    "max_score" : null."hits": [{"_index" : "collapse_test"."_type" : "_doc"."_id" : "5"."_score" : null."_source" : {
          "name" : "hello good me"."user" : {
            "id" : 5."age" : 19}},"fields" : {
          "user.age" : [
            19]},"sort" : [
          5]."inner_hits" : {
          "most_recent" : {
            "hits" : {
              "total" : {
                "value" : 1."relation" : "eq"
              },
              "max_score" : null."hits": [{"_index" : "collapse_test"."_type" : "_doc"."_id" : "5"."_score" : null."_source" : {
                    "name" : "hello good me"."user" : {
                      "id" : 5."age" : 19}},"sort" : [
                    5]}]}},"largest_responses" : {
            "hits" : {
              "total" : {
                "value" : 1."relation" : "eq"
              },
              "max_score" : null."hits": [{"_index" : "collapse_test"."_type" : "_doc"."_id" : "5"."_score" : null."_source" : {
                    "name" : "hello good me"."user" : {
                      "id" : 5."age" : 19}},"sort" : [
                    5]}]}}}}, {"_index" : "collapse_test"."_type" : "_doc"."_id" : "4"."_score" : null."_source" : {
          "name" : "hello good"."user" : {
            "id" : 4."age" : 17}},"fields" : {
          "user.age" : [
            17]},"sort" : [
          4]."inner_hits" : {
          "most_recent" : {
            "hits" : {
              "total" : {
                "value" : 3."relation" : "eq"
              },
              "max_score" : null."hits": [{"_index" : "collapse_test"."_type" : "_doc"."_id" : "4"."_score" : null."_source" : {
                    "name" : "hello good"."user" : {
                      "id" : 4."age" : 17}},"sort" : [
                    4] {},"_index" : "collapse_test"."_type" : "_doc"."_id" : "3"."_score" : null."_source" : {
                    "name" : "hello good"."user" : {
                      "id" : 3."age" : 17}},"sort" : [
                    3] {},"_index" : "collapse_test"."_type" : "_doc"."_id" : "2"."_score" : null."_source" : {
                    "name" : "hello good"."user" : {
                      "id" : 2."age" : 17}},"sort" : [
                    2]}]}},"largest_responses" : {
            "hits" : {
              "total" : {
                "value" : 3."relation" : "eq"
              },
              "max_score" : null."hits": [{"_index" : "collapse_test"."_type" : "_doc"."_id" : "2"."_score" : null."_source" : {
                    "name" : "hello good"."user" : {
                      "id" : 2."age" : 17}},"sort" : [
                    2] {},"_index" : "collapse_test"."_type" : "_doc"."_id" : "3"."_score" : null."_source" : {
                    "name" : "hello good"."user" : {
                      "id" : 3."age" : 17}},"sort" : [
                    3] {},"_index" : "collapse_test"."_type" : "_doc"."_id" : "4"."_score" : null."_source" : {
                    "name" : "hello good"."user" : {
                      "id" : 4."age" : 17}},"sort" : [
                    4]}]}}}}, {"_index" : "collapse_test"."_type" : "_doc"."_id" : "1"."_score" : null."_source" : {
          "name" : "hello"."user" : {
            "id" : 1."age" : 18}},"fields" : {
          "user.age" : [
            18]},"sort" : [
          1]."inner_hits" : {
          "most_recent" : {
            "hits" : {
              "total" : {
                "value" : 1."relation" : "eq"
              },
              "max_score" : null."hits": [{"_index" : "collapse_test"."_type" : "_doc"."_id" : "1"."_score" : null."_source" : {
                    "name" : "hello"."user" : {
                      "id" : 1."age" : 18}},"sort" : [
                    1]}]}},"largest_responses" : {
            "hits" : {
              "total" : {
                "value" : 1."relation" : "eq"
              },
              "max_score" : null."hits": [{"_index" : "collapse_test"."_type" : "_doc"."_id" : "1"."_score" : null."_source" : {
                    "name" : "hello"."user" : {
                      "id" : 1."age" : 18}},"sort" : [
                    1]}]}}}}]}} # collapse_test/_search {"collapse" : {
    "field"      : "user.age"."inner_hits" : {
      "name"     : "most_recent"."size"     : 4."sort"     : [{"user.id" : "desc"}]."collapse" : {
        "field" : "user.id"}}}} # result {"took" : 0."timed_out" : false."_shards" : {
    "total" : 1."successful" : 1."skipped" : 0."failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 5."relation" : "eq"
    },
    "max_score" : null."hits": [{"_index" : "collapse_test"."_type" : "_doc"."_id" : "1"."_score" : 1.0."_source" : {
          "name" : "hello"."user" : {
            "id" : 1."age" : 18}},"fields" : {
          "user.age" : [
            18]},"inner_hits" : {
          "most_recent" : {
            "hits" : {
              "total" : {
                "value" : 1."relation" : "eq"
              },
              "max_score" : null."hits": [{"_index" : "collapse_test"."_type" : "_doc"."_id" : "1"."_score" : null."_source" : {
                    "name" : "hello"."user" : {
                      "id" : 1."age" : 18}},"fields" : {
                    "user.id" : [
                      1]},"sort" : [
                    1]}]}}}}, {"_index" : "collapse_test"."_type" : "_doc"."_id" : "2"."_score" : 1.0."_source" : {
          "name" : "hello good"."user" : {
            "id" : 2."age" : 17}},"fields" : {
          "user.age" : [
            17]},"inner_hits" : {
          "most_recent" : {
            "hits" : {
              "total" : {
                "value" : 3."relation" : "eq"
              },
              "max_score" : null."hits": [{"_index" : "collapse_test"."_type" : "_doc"."_id" : "4"."_score" : null."_source" : {
                    "name" : "hello good"."user" : {
                      "id" : 4."age" : 17}},"fields" : {
                    "user.id" : [
                      4]},"sort" : [
                    4] {},"_index" : "collapse_test"."_type" : "_doc"."_id" : "3"."_score" : null."_source" : {
                    "name" : "hello good"."user" : {
                      "id" : 3."age" : 17}},"fields" : {
                    "user.id" : [
                      3]},"sort" : [
                    3] {},"_index" : "collapse_test"."_type" : "_doc"."_id" : "2"."_score" : null."_source" : {
                    "name" : "hello good"."user" : {
                      "id" : 2."age" : 17}},"fields" : {
                    "user.id" : [
                      2]},"sort" : [
                    2]}]}}}}, {"_index" : "collapse_test"."_type" : "_doc"."_id" : "5"."_score" : 1.0."_source" : {
          "name" : "hello good me"."user" : {
            "id" : 5."age" : 19}},"fields" : {
          "user.age" : [
            19]},"inner_hits" : {
          "most_recent" : {
            "hits" : {
              "total" : {
                "value" : 1."relation" : "eq"
              },
              "max_score" : null."hits": [{"_index" : "collapse_test"."_type" : "_doc"."_id" : "5"."_score" : null."_source" : {
                    "name" : "hello good me"."user" : {
                      "id" : 5."age" : 19}},"fields" : {
                    "user.id" : [
                      5]},"sort" : [
                    5]}]}}}}]}}Copy the code