This should probably be info.
15:47:30 INFO (TextAnalyzerServiceImpl:224) - Text extraction of http://localhost:8080/files/collection/composer/789_0.tif finished, 0 lines found
15:47:30 WARN (ProcessExecutor:143) - Tesseract Open Source OCR Engine v3.02.02 with Leptonica
15:47:30 WARN (ProcessExecutor:143) - Empty page!!
It should be stderr. Actual errors will end there as well.
But I guess we could adjust the log level based on the return value of tesseract.
Moving this to develop, as nobody is currently working on it and it will probably not make it to 1.6.0
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