How to use different analyzer for different fields when put them into _all

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1

the doc said that:
The _all field is a special catch-all field which concatenates the values of all of the other fields into one big string, using space as a delimiter, which is then analyzed and indexed, but not stored

but what I want is below:

field1: analyzerA
field2: anayzerB
field3: not_analyzed

and put these fields into _all.
how do I get same tokens in _all as it gets in field1, field2 and field3?

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