CBG-5457 Use 64 partitions for resync by default

Author: adamcfraser

db/background_mgr_resync_dcp.go

@@ -30,6 +30,8 @@ import (
 // Resync Implementation of Background Manager Process using DCP stream
 // =====================================================================
 
+const DefaultResyncPartitions = 64
+
 type ResyncManagerDCP struct {
 	db                           *DatabaseContext
 	docsProcessedLocal           atomic.Int64  // number of documents processed locally on this node since the last start or resume of resync
@@ -415,7 +417,7 @@ func (r *ResyncManagerDCP) Run(ctx context.Context, options ResyncOptions, persi
 		if db.Options.UnsupportedOptions != nil && db.Options.UnsupportedOptions.ResyncPartitions != nil && *db.Options.UnsupportedOptions.ResyncPartitions > 0 {
 			partitionCount = *db.Options.UnsupportedOptions.ResyncPartitions
 		} else {
-			partitionCount = db.Options.ImportOptions.ImportPartitions
+			partitionCount = DefaultResyncPartitions
 		}
 		base.DebugfCtx(ctx, base.KeyAll, "Using %d partitions for resync", partitionCount)