Fixed issue with mutating options

Author: ankane

lib/searchkick/relation.rb

@@ -695,6 +695,7 @@ def ensure_permitted(obj)
 
     def initialize_copy(other)
       super
+      @options = @options.deep_dup
       @execute = nil
     end
   end

test/relation_test.rb

@@ -23,6 +23,13 @@ def test_mutating
     assert_equal ["Product A"], products.map(&:name)
   end
 
+  def test_non_mutating
+    store_names ["Product A", "Product B"]
+    products = Product.search("*").order(:name)
+    products.limit(1)
+    assert_equal ["Product A", "Product B"], products.map(&:name)
+  end
+
   def test_load
     products = Product.search("*")
     refute products.loaded?