[web+ops+references] Remove references service code (#29699)

GitOrigin-RevId: 76656abe2e7b012355438d053a05e157bb719b0a

server-ce/config/settings.js

@@ -140,7 +140,6 @@ const settings = {
     api: redisConfig,
     pubsub: redisConfig,
     project_history: redisConfig,
-    references: redisConfig,
 
     project_history_migration: {
       host: redisConfig.host,
@@ -293,7 +292,6 @@ const settings = {
       ),
     },
   },
-  references: {},
   notifications: undefined,
 
   defaultFeatures: {
@@ -426,14 +424,6 @@ if (
   }
 }
 
-// /References
-// -----------
-if (process.env.OVERLEAF_ELASTICSEARCH_URL != null) {
-  settings.references.elasticsearch = {
-    host: process.env.OVERLEAF_ELASTICSEARCH_URL,
-  }
-}
-
 // filestore
 switch (process.env.OVERLEAF_FILESTORE_BACKEND) {
   case 's3':