原文地址: https://www.elastic.co/guide/en/elasticsearch/reference/7.7/analysis-lowercase-tokenizer.html, 原文档版权归 www.elastic.co 所有
IMPORTANT: No additional bug fixes or documentation updates
will be released for this version. For the latest information, see the
current release documentation.
Lowercase Tokenizeredit
The lowercase tokenizer, like the
letter tokenizer breaks text into terms
whenever it encounters a character which is not a letter, but it also
lowercases all terms. It is functionally equivalent to the
letter tokenizer combined with the
lowercase token filter, but is more
efficient as it performs both steps in a single pass.
Example outputedit
POST _analyze
{
"tokenizer": "lowercase",
"text": "The 2 QUICK Brown-Foxes jumped over the lazy dog's bone."
}
The above sentence would produce the following terms:
[ the, quick, brown, foxes, jumped, over, the, lazy, dog, s, bone ]
Configurationedit
The lowercase tokenizer is not configurable.