Make DeleteMeta pub (#2765)

Co-authored-by: Ming Ying <ming.ying.nyc@gmail.com>

src/index/index_meta.rs

@@ -13,9 +13,9 @@ use crate::store::Compressor;
 use crate::{Inventory, Opstamp, TrackedObject};
 
 #[derive(Clone, Debug, Serialize, Deserialize)]
-struct DeleteMeta {
+pub struct DeleteMeta {
     num_deleted_docs: u32,
-    opstamp: Opstamp,
+    pub opstamp: Opstamp,
 }
 
 #[derive(Clone, Default)]
@@ -213,7 +213,7 @@ impl SegmentMeta {
 struct InnerSegmentMeta {
     segment_id: SegmentId,
     max_doc: u32,
-    deletes: Option<DeleteMeta>,
+    pub deletes: Option<DeleteMeta>,
     /// If you want to avoid the SegmentComponent::TempStore file to be covered by
     /// garbage collection and deleted, set this to true. This is used during merge.
     #[serde(skip)]