[nostrademons]

Three options, depending on how demanding your users are:

1.) Don't. So what? That entry will never show up in search results, which is probably exactly what would've happened if you use a search engine with poor ranking, and exactly what will happen if you don't provide search at all.

2.) Blow away your index periodically and re-create it at off-peak times, or upon crash. Works as long as your data set is small enough to read it all off-peak.

3.) When you read your search results back, check them against the source-of-truth and re-index anything that's inconsistent. Relatively easy if there's a 1:1 correspondence between ElasticSearch documents and RDBMS tables; gets more difficult with complex joins.