Setting a default scope with react-instantsearch

I have built an app to search a few indices. Each index has a common attribute called site_id. I have setup my React components like below:

    <Configure hitsPerPage={10} />
    <SearchBox />
    <h3>Latest Events</h3>
    <Hits />
    <Index indexName="Venues">
      <h3>Latest Venues</h3>
      <Hits />
    <Index indexName="Users">
      <h3>Latest Users</h3>
      <Hits />

I would like to set a default scope, depending on the users site, that says site_id = 1. Something similar to default_scope in Rails.