r changes to any <a href="/api/indexes/type-aliases/concept/slice/"><code>Slice</code></a> (by providing <code>null</code> wildcards).</p><p>Both, either, or neither of the <code>indexId</code> and <code>sliceId</code> parameters can be wildcarded with <code>null</code>. You can listen to a specific <a href="/api/indexes/type-aliases/concept/slice/"><code>Slice</code></a> in a specific <a href="/api/indexes/type-aliases/concept/index/"><code>Index</code></a>, any <a href="/api/indexes/type-aliases/concept/s