How to apply fuzzy prefix matching on not_analyzed child field

Hi All,
I am new to elasticsearch. I am having difficulty in construction of query that will do prefix match along with fuzziness on non-analyzed field that is a child field.

i have mapping like A has property B. B has Property C. C is not_analyzed field. I need to do filter/search_as_you_type thing on it.
This works for me

"query" : {
"nested" : {
"path": "A.B",
"query": {
"prefix": {
"postcode": "W1"

Sorry for not constructing question correctly.

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