message: Marks list_all_segment_metas() as crate private
  Closes
diff: @@ -239,7 +239,7 @@ impl Index {
  /// Such segments can of course be part of the index,
  /// but also they could be segments being currently built or in the middle of a merge
  /// operation.
  - pub fn list_all_segment_metas(&self) -> Vec<SegmentMeta> {
  + pub(crate) fn list_all_segment_metas(&self) -> Vec<SegmentMeta> {
  self.inventory.all()
  }
  