Comment by mdaniel

The real vendor lock-in for ES (and now AWS OS) is the REST query API; if Solr implemented ES's API, I bet $1 a lot more people would have moved or at least considered moving over

IIRC Solr also has some weird stuff about schemaless indices, whereas ES took the very Mongo-y approach of "yeah, just throw content at the index, don't worry about it" but then separately the approach of "I am angry with your new conflicting field in that document" and throws an exception; so you don't have to worry about the schema right up until you do have to worry about it