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/book.py

@@ -10,6 +10,7 @@
 #  See the License for the specific language governing permissions and
 #  limitations under the License.
 #
+import logging
 from tika import parser
 import re
 from io import BytesIO
@@ -20,7 +21,6 @@ from rag.nlp import bullets_category, is_english,remove_contents_table, \
     tokenize_chunks
 from rag.nlp import rag_tokenizer
 from deepdoc.parser import PdfParser, DocxParser, PlainParser, HtmlParser
-from api.utils.log_utils import logger
 
 
 class Pdf(PdfParser):
@@ -39,7 +39,7 @@ class Pdf(PdfParser):
         start = timer()
         self._layouts_rec(zoomin)
         callback(0.67, "Layout analysis finished")
-        logger.info("layouts: {}".format(timer() - start))
+        logging.debug("layouts: {}".format(timer() - start))
         self._table_transformer_job(zoomin)
         callback(0.68, "Table analysis finished")
         self._text_merge()