analyser.json

//Every query goes through this analyzer
"search_analyzer": {
    "type": "custom",
    "tokenizer": "standard",
    "char_filter": [
        "ampersand",      
   ],
    "filter": [
        "lowercase",
        "asciifolding",
        "snowball_stemmer"
    ]
}
//converts '&' to 'and'
"char_filter": {
    "ampersand": {
    "type": "pattern_replace",
    "pattern": "\\s*&\\s*",
    "replacement": " and "
}