fix startOffset (#1081)

fixes #1079

Author: PSeitz

quickwit-search/src/collector.rs

@@ -289,10 +289,14 @@ impl Collector for QuickwitCollector {
         // We compute the overall [0..start_offset + max_hits) documents ...
         let num_hits = self.start_offset + self.max_hits;
         let mut merged_leaf_response = merge_leaf_responses(segment_fruits, num_hits);
-        // ... and drop the first [..start_offets) hits.
+        // ... and drop the first [..start_offsets) hits.
         merged_leaf_response
             .partial_hits
-            .drain(0..self.start_offset)
+            .drain(
+                0..self
+                    .start_offset
+                    .min(merged_leaf_response.partial_hits.len()),
+            )
             .count(); //< we just use count as a way to consume the entire iterator.
         Ok(merged_leaf_response)
     }