Can anyone provide some advice please, we have a load balanced Alfresco CE 4 environment using Solr for indexing. The environment has two front end Alfresco servers, each pointing to their own solr server. The Alfresco environments are synchronized, however we are seeing a difference in the stats and disk space used on the solr servers. 4GB of disk space used more in solr server 2 even though the stats indicate 41558 less documents. Is it worth running a repair on the indexes? re-building the indexes takes 4-5 days and leaves the system unusable so didn't really want to go down that road unless essential.
Re: Mismatched Solr Index numDocs and Size on Disk
If you trust server 2, I would recommend copying the index directories from that server to server 1. This is a well known procedure during upgrades of clusters (that is, creating the index in a single server, and then copy the files to the other servers).
As usual, keep a backup copy of index 1, just in case. Ideally, you should stop both servers before getting the backup and performing the copy of the files. Although that may mean a short period of down time, it will be much faster that performing a full reindex.