Hi @sandeepkumar53,
the easiest solution, if it's acceptable for you, it's using a Radio button in addition to the for dropdown to choose the dropdown to use.
otherwise, you should find a default value for each dropdown that you're sure that isn't present (eg "XXXXXXXXXXXXXXXXXX") in this way you'll have a search like this
(index=A field1=$D1$) OR (index=B field2=$D2$) OR (index=C field3=$D3$) OR (index=D field4=$D4$)
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So by default you'll have this situation
(index=A field1=XXXXXXXXXXXXXXXXXX) OR (index=B field2=XXXXXXXXXXXXXXXXXX) OR (index=C field3=XXXXXXXXXXXXXXXXXX) OR (index=D field4=XXXXXXXXXXXXXXXXXX)
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that hasn't any result, but when you choose a value for one dropdown you'll have results because you'll use a real value.
But in this way you could use more than one dropdown at the same time.
Ciao.
Giuseppe
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