services: change DefaultSearchBatchSize to be able to search in parallel

Revert #3670. As NeoFS searchv2 result limit is 1000, the
DefaultSearchBatchSize could be little bit less to get full range with
one request, even if there are duplicates.

Close #3707

Signed-off-by: Ekaterina Pavlova <[email protected]>

Author: AliceInHunterland

pkg/services/blockfetcher/blockfetcher.go

@@ -375,7 +375,6 @@ func (bfs *Service) streamBlockOIDs(rc io.ReadCloser, startIndex, skip int) erro
 // fetchOIDsBySearch fetches block OIDs from NeoFS by searching through the Block objects.
 func (bfs *Service) fetchOIDsBySearch() error {
 	startIndex := bfs.heightFunc()
-	//We need to search with EQ filter to avoid partially-completed SEARCH responses.
 	batchSize := uint32(neofs.DefaultSearchBatchSize)
 
 	for {

pkg/services/helpers/neofs/blockstorage.go

@@ -28,12 +28,8 @@ const (
 	// DefaultKVBatchSize is a number of contract storage key-value objects to
 	// flush to the node's DB in a batch.
 	DefaultKVBatchSize = 1000
-	// DefaultSearchBatchSize is a number of objects to search in a batch. We need to
-	// search with EQ filter to avoid partially-completed SEARCH responses. If EQ search
-	// hasn't found object the object will be uploaded one more time which may lead to
-	// duplicating objects. We will have a risk of duplicates until #3645 is resolved
-	// (NeoFS guarantees search results).
-	DefaultSearchBatchSize = 1
+	// DefaultSearchBatchSize is a number of objects to search in a batch.
+	DefaultSearchBatchSize = 950
 )
 
 // Constants related to NeoFS pool request timeouts.