remove index creation from query methods

lib/storage.js

@@ -128,9 +128,6 @@ Storage.prototype.storeWalletAndUpdateCopayersLookup = function(wallet, cb) {
 };
 
 Storage.prototype.fetchCopayerLookup = function(copayerId, cb) {
-  this.db.collection(collections.COPAYERS_LOOKUP).createIndex({
-    copayerId: 1
-  });
   this.db.collection(collections.COPAYERS_LOOKUP).findOne({
     copayerId: copayerId
   }, function(err, result) {
@@ -346,9 +343,6 @@ Storage.prototype.storeAddressAndWallet = function(wallet, addresses, cb) {
 Storage.prototype.fetchAddress = function(address, cb) {
   var self = this;
 
-  this.db.collection(collections.ADDRESSES).createIndex({
-    address: 1
-  });
   this.db.collection(collections.ADDRESSES).findOne({
     address: address,
   }, function(err, result) {