Thank you very much @ka786 for your effort to solve an issue, In plain 6.5 servers it works perfectly. We did migration from 6.3 to 6.5, the crx it contains the node "/oak:index/damAssetLucene/analyzers". if I remove the node "analyzers" node under "/oak:index/damAssetLucene/" it works perfectly. I am not sure what exactly makes this work by adding and removing these nodes and going to study as well. please reply if anyone knows about this.