Combinig queries dilemma

I am quite new to ES and have used some example code provided by someone
else to get me to where I am at the moment.

I'm using the Elastica PHP wrapper to produce the queries, just FYI
although it has no bearing on what I'm asking.

I have used the Querystring query to perform my search so I can use the AND
and OR keywords. The client is requesting fuzzy based searching while
maintaining the querystring style, and I'm at a complete loss as to how to
do this with ES.

My current query object looks like this:

"query":{
    "query_string":{
        "query":"chicken OR fish",
        "default_operator":"AND",
        "fields":["*.custom_fulltext"]
    }
}

Which searches a custom index in a lot of multi_fields throughout our
multiple mappings.

I've found examples on how to fuzzy search multiple fields, where I would
have to reproduce the query multiple times for each field. This I can't do
as we have over 10 mappings and many fields in each one, and the cost of
query overhead to do this is too much.

What I need to know is how to do both styles of query at the same time and
produce results as would be generated from the example, but using fuzzy
logic on every keyword in case someone misspels a word.

Any help anyone can give me would be greatly appreciated as I've been stuck
for days staring at ES docs with no clue.

Thanks in advance.

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