Revert "Re-export some default as vars, change default limit to 250"

This reverts commit 58afaaf.

Author: viciious

defaults.go

@@ -4,15 +4,13 @@ import "time"
 
 const (
 	DefaultIndex = "primary"
-
-)
-
-var (
-	DefaultLimit = 250
+	DefaultLimit = 100
 
 	DefaultConnectTimeout = time.Second
 	DefaultQueryTimeout   = time.Second
+)
 
+var (
 	DefaultReaderBufSize = 16 * 1024
 	DefaultWriterBufSize = 4 * 1024