diff --git a/core/api/models/messages.model.mongodb.js b/core/api/models/messages.model.mongodb.js
index c1cc35074..a2341098b 100644
--- a/core/api/models/messages.model.mongodb.js
+++ b/core/api/models/messages.model.mongodb.js
@@ -4,4 +4,6 @@ export default function (app, options) {
   // Collation provided in query ensure sorting to be case insensitive w.r.t. user's language
   // We built indices with collation to cover the most used languages, it requires different naming...
   options.Model.createIndex({ createdAt: -1 })
+  options.Model.createIndex({ body: 1 }, { name: 'body-en', collation: { locale: 'en', strength: 1 } })
+  options.Model.createIndex({ body: 1 }, { name: 'body-fr', collation: { locale: 'fr', strength: 1 } })
 }
\ No newline at end of file