private void sendStdErrToOutputStream(final Process process, final OutputStream outputStream) {
        multiThreadedStreamCopy(process.getErrorStream(), outputStream);
    }
Starts a thread that reads and discards the contents of the standard
stream of the given process. Potential exceptions are ignored, and the
stream is closed once fully processed.

@param process the process
               param outputStream the output stream to send to standard error of the process
tika-core/src/main/java/org/apache/tika/embedder/ExternalEmbedder.java