temporary file under 'tomcat/temp/Alfresco/2020/.../*.bin' becomes bigger and bigger
after a successfull bulk import in ACS 6.2, my disk went full and this is due to a file 'E:\Alfresco\tomcat\temp\Alfresco\2020\11\19\20\43\a4ce466c-aef0-4227-8b9d-39b9c322902d.bin' which grows and grows to reach a size of 1To !
Now each time, I start Alfresco after having suppressed this file, the file reapper and starts to grow again. Other files after startup are also under this folder but they disappear after a while.
What are these files ? which component creates them ? how can I identify the problem related to this specific file ?