Create weight in multiple index scenario. Distributed query processing is done in the following steps: 1. rewrite query 2. extract necessary terms 3. collect dfs for these terms from the Searchables 4. create query weight using aggregate dfs. 5. distribute that weight to Searchables 6. merge results Steps 1-4 are done here, 5+6 in the search() methods

public override Weight CreateWeight(
	Query original
)

Public Overrides Function CreateWeight ( _
	original As Query _
) As Weight

public:
virtual Weight^ CreateWeight(
	Query^ original
) override