ES/backup: fix issue with monthly/yearly copies.

The condition "first week of the month" would be TRUE 7 days in a row,
meaning that the first day "monthly/$fname" is found missed, it will be
created -- and all the other days logrotate would produce error messages
like `ln: creating hard link ...: File exists`. It doesn't look really
good and makes me wonder: maybe some time monthly rotation might happen
*after* this "first week", and we would end up without monthly copy?

So now new copy is created next to the rotation of monthly/yearly
copies. And it seems to look better now.

Utils/Elasticsearch/tools/daily/es_backup.logrotate

@@ -11,23 +11,14 @@ extension .tar.gz
     rotate 4
     prerotate
         base_dir=%%DIR%%
-        # create dirs for monthly/yearly copies
+
+        # handle monthly/yearly copies
         for d in monthly yearly; do
             mkdir -p -m 0700 "${base_dir}/$d"
+            fname="${base_dir}/$d/`basename $1`"
+            [ -f "${fname}" ] || ln "$1" "$fname"
         done
 
-        fname=`basename $1`
-
-        # copy rotated file:
-
-        # - to monthly backups every 1st week of the month
-        day=`date +%_d`
-        [ $day -ge 1 -a $day -le 7 ] && ln "$1" "${base_dir}/monthly/${fname}"
-
-        # - to yearly backups every 1st week of the year
-        day=`date +%_j`
-        [ $day -ge 1 -a $day -le 7 ] && ln "$1" "${base_dir}/yearly/${fname}"
-
         # make sure we return "success"
         true
     endscript