title: Apache Beam - Read all files from directory
body: <p>I have a dataflow pipeline where i use the below AvroIO method to read a specific avro file with a known schema .. </p>
  
  <p>However I would like to read all of the files inside a directory matching a file extension pattern recursively in the pipeline instead of reading a single file.. Need some help in this</p>
  
  <pre><code>pipeline.apply("Read from Avro",
   AvroIO.readGenericRecords(schema).from("gcs://test/test.avro")
  </code></pre>