如何使用通配符弹性搜索 java 搜索不区分大小写

Question

I want to search case insensitive using wildcard.

    BoolQueryBuilder paramFilter = QueryBuilders.boolQuery();
    paramFilter.must(QueryBuilders.wildcardQuery(field, "*"+key+"*"));

Answer 1

if you are running Elasticsearch > v7.10, you can set the case_insensitive parameter of the wildcard query to true .

otherwise, you can add to the mapping of your field a multi-field with a custom analyzer that sets a keyword tokenizer and a lowercase filter to the field's string. This way, you'll be able to run your wildcard query against the multi-field.