Kevin, Just want to be clear. You certainly can aggregate field values into the _all field (and selectively field by field too). However, the values that are aggregated are the raw field values from your source document. They all appended together *and then* all analyzed uniformly by whatever is the analyzer of the _all field (which is the standard analyzer by default). I do not believe there is a way to aggregate the *already-analyzed* tokens (i.e. not the raw source field values) into a single field. Just for clarification. :)
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