Use consistent log file names, introduced initLogger (#3403)

### What problem does this PR solve?

Use consistent log file names, introduced initLogger

### Type of change

- [ ] Bug Fix (non-breaking change which fixes an issue)
- [ ] New Feature (non-breaking change which adds functionality)
- [ ] Documentation Update
- [x] Refactoring
- [ ] Performance Improvement
- [ ] Other (please describe):

rag/app/manual.py

@@ -14,6 +14,7 @@
 #  limitations under the License.
 #
 
+import logging
 import copy
 import re
 
@@ -24,7 +25,6 @@ from rag.utils import num_tokens_from_string
 from deepdoc.parser import PdfParser, PlainParser, DocxParser
 from docx import Document
 from PIL import Image
-from api.utils.log_utils import logger
 
 
 class Pdf(PdfParser):
@@ -48,11 +48,11 @@ class Pdf(PdfParser):
         # for bb in self.boxes:
         #    for b in bb:
         #        print(b)
-        logger.info("OCR: {}".format(timer() - start))
+        logging.debug("OCR: {}".format(timer() - start))
 
         self._layouts_rec(zoomin)
         callback(0.65, "Layout analysis finished.")
-        logger.info("layouts: {}".format(timer() - start))
+        logging.debug("layouts: {}".format(timer() - start))
         self._table_transformer_job(zoomin)
         callback(0.67, "Table analysis finished.")
         self._text_merge()