Hello! My colleague Matt has just written about a recent project where he's been building ES plugins for ontology indexing. Hope you find it interesting and the plugins useful - and we welcome feedback, especially hints as to where we've gone wrong and/or better ways to do it.
This is part of a publically-funded project here in the UK to develop better open source search software for bioinformaticians - it's called BioSolr for historical reasons but we're also using ES. We'll be talking about this at a workshop event near Cambridge next week.