gunzip multiple gz files with same compressed file name in multiple folders

I have a directory where there are multiple folders, each folder contains multiple .gz files with the same zipped file name "spark.log". How can I unzip all of them at once and rename them like the gz file? My data looks like this List of folders A B C D In every of them there are files as A spark.log.gz spark.log.1.gz spark.log.2.gz spark.log.3.gz B spark.log.gz spark.log.1.gz spark.log.2.gz spark.log.3.gz C spark.log.gz spark.log.1.gz spark.log.2.gz spark.log.3.gz D spark.log.gz spark.log.1.gz spark.log.2.gz spark.log.3.gz in each of the gz file contains spark.log, I'd like to be able to unzip and rename them according to their gz name. For example: spark.log.1.gz -> spark.log.1.log