ES: update schema

app/models/index_status.rb

 class IndexStatus < ActiveRecord::Base
   belongs_to :project
 
-  validates :project_id, uniqueness: true, presense: true
+  validates :project_id, uniqueness: true, presence: true
 end

db/schema.rb

@@ -449,7 +449,7 @@ ActiveRecord::Schema.define(version: 20160129075828) do
   add_index "identities", ["user_id"], name: "index_identities_on_user_id", using: :btree
 
   create_table "index_statuses", force: :cascade do |t|
-    t.integer  "project_id"
+    t.integer  "project_id",  null: false
     t.datetime "indexed_at"
     t.text     "note"
     t.string   "last_commit"
@@ -457,7 +457,7 @@ ActiveRecord::Schema.define(version: 20160129075828) do
     t.datetime "updated_at",  null: false
   end
 
-  add_index "index_statuses", ["project_id"], name: "index_index_statuses_on_project_id", using: :btree
+  add_index "index_statuses", ["project_id"], name: "index_index_statuses_on_project_id", unique: true, using: :btree
 
   create_table "issues", force: :cascade do |t|
     t.string   "title"

lib/tasks/gitlab/elastic.rake

@@ -11,9 +11,9 @@ namespace :gitlab do
           puts "Indexing #{project.name_with_namespace} (ID=#{project.id})..."
 
           index_status = IndexStatus.find_or_create_by(project: project)
-          heads_sha = project.repository.commit.sha
+          head_sha = project.repository.commit.sha
 
-          if index_status.last_commit == heads_sha
+          if index_status.last_commit == head_sha
             puts "Skipped".yellow
             next
           end
@@ -24,7 +24,7 @@ namespace :gitlab do
 
             # During indexing the new commits can be pushed,
             # the last_commit parameter only indicates that at least this commit is in index
-            index_status.update(last_commit: heads_sha, indexed_at: DateTime.now)
+            index_status.update(last_commit: head_sha, indexed_at: DateTime.now)
             puts "Done!".green
           rescue StandardError => e
             puts "#{e.message}, trace - #{e.backtrace}"