Hi,
For information, I find whats could be the problem ...
I just increase the availible RAM of elasticsearch JVM ( /etc/elasticsearch/jvm.options ). By default, it's seting ip to 4Gb, which is absolutly not enough for requestion several billions of docs. I increase it to 48 Gb. Now, I can request for few days, if there is no more 7 days, I can finalise my request without errors. If it can help someone...
Thanks for the answers.
Regards.