Add missing 's' to tmpdir name (#27721)

When using mktemp from coreutils there was an 's' missing from
elasticsearch.

Follow-up for #27659

distribution/src/main/resources/bin/elasticsearch-env

@@ -80,7 +80,7 @@ if [ -z "$ES_TMPDIR" ]; then
   mktemp_coreutils=$?
   set -e
   if [ $mktemp_coreutils -eq 0 ]; then
-    ES_TMPDIR=`mktemp -d --tmpdir "elasticearch.XXXXXXXX"`
+    ES_TMPDIR=`mktemp -d --tmpdir "elasticsearch.XXXXXXXX"`
   else
     ES_TMPDIR=`mktemp -d -t elasticsearch`
   fi