在Elasticsearch中索引字符串的最后一个单词

PUT /my_index
{
  "settings": {
    "analysis": {
      "analyzer": {
        "my_analyzer": {
          "tokenizer": "standard",
          "filter": [
            "lowercase",
            "my_token_filter"
          ]
        }
      },
      "filter": {
        "my_token_filter": {
          "type": "word_delimiter",
          "preserve_original": true
        }
      }
    }
  },
  "mappings": {
    "properties": {
      "my_field": {
        "type": "text",
        "analyzer": "my_analyzer"
      }
    }
  }
}

PUT /my_index/_doc/1
{
  "my_field": "Hello world! This is an example."
}

GET /my_index/_search
{
  "query": {
    "wildcard": {
      "my_field": "*example"
    }
  }
}