elasticsearch自定义分析器

PUT /my_index{    "settings": {        "analysis": {            "char_filter": {                "&_to_and": {                    "type":       "mapping",                    "mappings": [ "& => and "]            }},            "filter": {                "my_stopwords": {                    "type":       "stop",                    "stopwords": [ "the", "a" ]            }},            "analyzer": {                "my_analyzer": {                    "type":         "custom",                    "char_filter":  [ "html_strip", "&_to_and" ],                    "tokenizer":    "standard",                    "filter":       [ "lowercase", "my_stopwords" ]            }}        }     }}