be consistent about cloud behavior

node/src/remote/index.ts

@@ -93,6 +93,10 @@ export class RemoteQuery<T = number[]> extends Query<T> {
       queryVector = query as number[]
     }
 
+    if ((this as any)._useIndex === false) {
+      throw new Error('LanceDB Cloud does not yet support useIndex=false')
+    }
+
     const data = await this._client.search(
       this._name,
       queryVector,

python/lancedb/remote/table.py

@@ -103,7 +103,7 @@ class RemoteTable(Table):
             raise NotImplementedError("Cloud support for prefiltering is coming soon")
         if not query.use_index:
             raise NotImplementedError(
-                "Cloud does not support non-indexed queries if the table has indices"
+                "LanceDB Cloud does not yet support use_index=False"
             )
         result = self._conn._client.query(self._name, query)
         return self._conn._loop.run_until_complete(result).to_arrow()