Can multi match and type phrase be used on _all

Hi there,
Let 's say I have the following code:

    "multi_match": {
                                        "query": x,
                                         "type": "phrase",
                                         "fields":"_all",   
                                     }

x is a keyword in an array of keywords. I know that using _all will concatenate the values for each filed into one big string separated by tabs. Now, my question is that in the above example x is searched in each indexed value?

Thanks,

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