cloneUsingNexExpCtx clones an expression and sets it to use a new context by using the parse and serialise approach. We should remove this method and re-use the clone method that was added in 8.3. The clone method at the moment does not accept a new ExpressionContext but uses the existing one, we should update the method to require an ExpressionContext. The caller should decide if it will re-use the ExpressionContext it has or a new one.