es – elasticsearch mapping – parameters – normalizer

There is no such thing as perfect programming, but we shouldn’t be discouraged because programming is a constant pursuit of perfection.

Q: What’s special about Normalizer?

A:



Q: How do I use Normalizer?

A:

# normalizer
PUT /normalizer_test
{
  "settings" : {
    "analysis" : {
      "normalizer" : {
        "my_normalizer" : {
          "type"        : "custom"."char_filter" : {},
          "filter"      : ["lowercase"."asciifolding"}}}},"mappings" : {
    "properties": {
      "name" : {
        "type"       : "keyword"."normalizer" : "my_normalizer"
      }
    }
  }
}

# 索引
POST /normalizer_test/_doc/1
{
  "name" : "The BAR"} # index POST /normalizer_test/_doc/2
{
  "name" : "bar"} # index POST /normalizer_test/_doc/3
{
  "name" : "Bar"} # GET /normalizer_test/_search {"query" : {
    "term" : {
      "name" : "BAR"}}} # result {"took" : 11."timed_out" : false."_shards" : {
    "total" : 1."successful" : 1."skipped" : 0."failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 3."relation" : "eq"
    },
    "max_score" : 0.13353139."hits": [{"_index" : "normalizer_test"."_type" : "_doc"."_id" : "1"."_score" : 0.13353139."_source" : {
          "name" : "The BAR"}}, {"_index" : "normalizer_test"."_type" : "_doc"."_id" : "2"."_score" : 0.13353139."_source" : {
          "name" : "bar"}}, {"_index" : "normalizer_test"."_type" : "_doc"."_id" : "3"."_score" : 0.13353139."_source" : {
          "name" : "Bar"}} GET /normalizer_test/_search {"aggs": {
    "normalizer_aggs" : {
      "terms" : {
        "field" : "name"."size"  : 10}}}} # result {"took" : 11."timed_out" : false."_shards" : {
    "total" : 1."successful" : 1."skipped" : 0."failed" : 0
  },
  "hits" : {
    "total" : {
      "value" : 3."relation" : "eq"
    },
    "max_score" : 1.0."hits": [{"_index" : "normalizer_test"."_type" : "_doc"."_id" : "1"."_score" : 1.0."_source" : {
          "name" : "The BAR"}}, {"_index" : "normalizer_test"."_type" : "_doc"."_id" : "2"."_score" : 1.0."_source" : {
          "name" : "bar"}}, {"_index" : "normalizer_test"."_type" : "_doc"."_id" : "3"."_score" : 1.0."_source" : {
          "name" : "Bar"}}},"aggregations" : {
    "normalizer_aggs" : {
      "doc_count_error_upper_bound" : 0."sum_other_doc_count" : 0."buckets": [{"key" : "bar"."doc_count" : 3}]}}}Copy the code