Add fts search index.

priv/repo/migrations/20170916090107_add_fts_index_to_activities.exs

@@ -0,0 +1,8 @@
+defmodule Pleroma.Repo.Migrations.AddFTSIndexToActivities do
+  use Ecto.Migration
+  @disable_ddl_transaction true
+
+  def change do
+    create index(:activities, ["(to_tsvector('english', data->'object'->>'content'))"], concurrently: true, using: :gin, name: :activities_fts)
+  end
+end