I have been told that when there are load balancers and multiple servers, lucene will not work.
Is there an alternative that we can still use Lucene as the search engine.
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You might have read that Solr is a better solution, but Lucene does work. You will have indexes on all your servers though.
More info on a similar question here: How to maintain Sitecore Lucene Indexes in a huge content delivery web farm?