Fix ef value for insertion Searches

src/lib.rs

@@ -214,6 +214,7 @@ where
         let mut batch = Vec::new();
         let mut done = Vec::new();
         let mut insertion = Search::default();
+        insertion.ef = ef_construction;
         let max_batch_len = num_cpus::get() * 4;
         for (layer, mut range) in ranges {
             let num = if layer.0 > 0 { M } else { M * 2 };