possible fix for manyToMany relationships using indexes

lib/associations/has-many.js

@@ -131,10 +131,14 @@ module.exports = (function() {
     }
 
     if (typeof this.through.model === 'string') {
-      this.through.model = this.sequelize.define(this.through.model, {}, _.extend(this.options, {
+      var defineOptions = _.extend(this.options, {
         tableName: this.through.model,
         paranoid: false  // A paranoid join table does not make sense
-      }));
+      });
+      //we dont want indexes here
+      delete defineOptions.indexes;
+      console.log(defineOptions);
+      this.through.model = this.sequelize.define(this.through.model, {}, defineOptions);
 
       if (this.targetAssociation) {
         this.targetAssociation.through.model = this.through.model;