diff --git a/lib/mongoid_fulltext.rb b/lib/mongoid_fulltext.rb
index <HASH>..<HASH> 100644
--- a/lib/mongoid_fulltext.rb
+++ b/lib/mongoid_fulltext.rb
@@ -67,8 +67,8 @@ module Mongoid::FullTextSearch
         index_definition = [['ngram', Mongo::ASCENDING], ['score', Mongo::DESCENDING]].concat(filter_indexes)        
       end
 
-      coll.ensure_index(index_definition, name: 'fts_index')
-      coll.ensure_index([['document_id', Mongo::ASCENDING]]) # to make removes fast
+      coll.ensure_index(index_definition, { name: 'fts_index', background: true })
+      coll.ensure_index([['document_id', Mongo::ASCENDING]], { background: true }) # to make removes fast
     end
 
     def fulltext_search(query_string, options={})
Changed ensure_index to index in the background, avoid blocking booting app.