I gave you an answer that works efficiently by operating on metadata. You can work with eval and other post-pipe commands (e.g. regex ) but your search efficiency will suffer (which may or may not be important to you).
index=myIndex | regex phone="4155550123$"
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How about using
( Foo=$searchText$ OR Bar=$searchText$ )
Or, maybe you can do input selection for two drop-downs ; one for Foo and the other for Bar. Then, you can use the similar query ;
( Foo=$vaalue_foo$ OR Bar=$value_bar$ )
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