I recommend writing down what exactly scale means for your needs. Number of users? Number of queries? Number of sources? Number of 'result-sets'? Number of documents? Number of text fields?
Elasticsearch is built on-top-of Lucene which is a Java API that you can use in pretty much any application. If you already have a system that can search the MySQL clusters then I would recommend hooking Lucene into that system instead of standing up another one.
Elasticsearch is built on-top-of Lucene which is a Java API that you can use in pretty much any application. If you already have a system that can search the MySQL clusters then I would recommend hooking Lucene into that system instead of standing up another one.