Revert "Added deep_dup to initial options [skip ci]"

This reverts commit 896bc7a.

Author: ankane

lib/searchkick/relation.rb

@@ -14,7 +14,7 @@ class Relation
     def initialize(model, term = "*", **options)
       @model = model
       @term = term
-      @options = options.deep_dup
+      @options = options
 
       # generate query to validate options
       query