How do fuzzy Query work

Hello Folks, can anybody correct me my following search query, what i am doing wroing , cause it did not work. i want to search in a field "word" for a specific word "wellcoming" using must query, but i want it to tolerate some missing Letter like if i write "welcming" , how to control the nummber of tolerated letters??
, i used "fuzziness":2 in order to tolerate 2 letter in the word.
GET test\_search
{
"query":{
"bool":{
"must":[
"fuzzy":{
{ "match": { "word": "wellcoming" ,"fuzziness": 2} }
} ]
}
}
}

thx.

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