在多个应用服务器上同步Lucene.net索引

we are designing the search architecture for a corporate web application. We'll be using Lucene.net for this. The indexes will not be big (about 100,000 documents), but the search service must be always up and always be up to date. There will be new documents added to the index all the time and concurrent searches. Since we must have high availability for the search system, we have 2 application servers which expose a WCF service to perform searches and indexing (a copy of the service is running in each server). The server then uses lucene.net API to access the indexes.we are designing the search architecture for a