Is it possible to merge facets?

We have data from two different sources. They do not always name things the same way. For example, one source might call it “Voltage” and the other “Volts.”

These would both be facets in the index.

Is it possible to configure a merger of those two facets so that the visitor only sees “Voltage” and values from both facets appear in the filter?

Thank you

Was there a resolution for this?