大写词元过滤器
uppercase 词元过滤器用于在分析期间将所有词元（单词）转换为大写。
示例
以下示例请求创建一个名为 uppercase_example 的新索引，并配置一个带有 uppercase 过滤器的分析器
PUT /uppercase_example
{
"settings": {
"analysis": {
"filter": {
"uppercase_filter": {
"type": "uppercase"
}
},
"analyzer": {
"uppercase_analyzer": {
"type": "custom",
"tokenizer": "standard",
"filter": [
"lowercase",
"uppercase_filter"
]
}
}
}
}
}
生成的词元
使用以下请求检查使用该分析器生成的词元
GET /uppercase_example/_analyze
{
"analyzer": "uppercase_analyzer",
"text": "OpenSearch is powerful"
}
响应包含生成的词元
{
"tokens": [
{
"token": "OPENSEARCH",
"start_offset": 0,
"end_offset": 10,
"type": "<ALPHANUM>",
"position": 0
},
{
"token": "IS",
"start_offset": 11,
"end_offset": 13,
"type": "<ALPHANUM>",
"position": 1
},
{
"token": "POWERFUL",
"start_offset": 14,
"end_offset": 22,
"type": "<ALPHANUM>",
"position": 2
}
]
}