code: public boolean release(long index) {
      assertSegmentOpen();
      long offset = offsetIndex.find(relativeOffset(index));
      return offset != -1 && offsetPredicate.release(offset);
    }
docs: Releases an entry from the segment.
  
  @param index The index of the entry to release.
  @return Indicates whether the entry was newly released from the segment.
  @throws IllegalStateException if the segment is not open