[minor] replaced db_save by db_update and added patch to remove the indexes on tabBin

erpnext/patches.txt

@@ -399,3 +399,4 @@ erpnext.patches.v8_0.make_payments_table_blank_for_non_pos_invoice
 erpnext.patches.v8_0.delete_schools_depricated_doctypes
 erpnext.patches.v8_0.update_customer_pos_id
 erpnext.patches.v8_0.rename_items_in_status_field_of_material_request
+erpnext.patches.v8_0.delete_bin_indexes

erpnext/patches/v8_0/delete_bin_indexes.py

@@ -0,0 +1,16 @@
+# Copyright (c) 2017, Frappe and Contributors
+# License: GNU General Public License v3. See license.txt
+# -*- coding: utf-8 -*-
+
+from __future__ import unicode_literals
+import frappe
+
+def execute():
+	# delete bin indexes
+	unwanted_indexes = ["item_code", "warehouse"]
+
+	for k in unwanted_indexes:
+		try:
+			frappe.db.sql("drop index {0} on `tabBin`".format(k))
+		except:
+			pass

erpnext/stock/doctype/bin/bin.json

@@ -40,7 +40,7 @@
    "remember_last_selected_value": 0, 
    "report_hide": 0, 
    "reqd": 0, 
-   "search_index": 1, 
+   "search_index": 0, 
    "set_only_once": 0, 
    "unique": 0
   }, 
@@ -72,7 +72,7 @@
    "remember_last_selected_value": 0, 
    "report_hide": 0, 
    "reqd": 0, 
-   "search_index": 1, 
+   "search_index": 0, 
    "set_only_once": 0, 
    "unique": 0
   }, 
@@ -463,7 +463,7 @@
  "issingle": 0, 
  "istable": 0, 
  "max_attachments": 0, 
- "modified": "2017-06-08 18:42:44.714839", 
+ "modified": "2017-06-13 13:06:32.601505", 
  "modified_by": "Administrator", 
  "module": "Stock", 
  "name": "Bin", 

erpnext/stock/doctype/bin/bin.py

@@ -72,10 +72,9 @@ class Bin(Document):
 		self.reserved_qty = flt(self.reserved_qty) + flt(args.get("reserved_qty"))
 		self.indented_qty = flt(self.indented_qty) + flt(args.get("indented_qty"))
 		self.planned_qty = flt(self.planned_qty) + flt(args.get("planned_qty"))
-		
-		self.set_projected_qty()
 
-		self.db_save()
+		self.set_projected_qty()
+		self.db_update()
 
 	def set_projected_qty(self):
 		self.projected_qty = (flt(self.actual_qty) + flt(self.ordered_qty)