message: Don't search whole blocks, but only the remaining part
diff: @@ -115,7 +115,7 @@ impl<'a> DocSet for SegmentPostings<'a> {
  debug_assert!(target >= block_docs[self.cur]);
  debug_assert!(target <= block_docs[block_len - 1]);
  - let mut start = 0;
  + let mut start = self.cur;
  let mut end = block_len;
  let mut count = 1;
  loop {
  