title: Finding documents containing a phrase in a big corpus
body: <p>I have a big corpus of text documents, which is dynamically updated. Every second nearly 100 new documents are added to this corpus.</p>
  <p>I want to find the documents that contain an input phrase query (or one of the input phrases) in real-time. The queries also come sequentially with a high rate.</p>
  <p>What is the right tool to implement this? Is Elasticsearch the appropriate one or there are lighter tools?</p>