Don't create tempdir for cli scripts

The elasticsearch-cli helper script does not use the tempdir created by
elasticsearch-env, yet the env script still creates it. This can lead to
lots of temp directories being created when running cli scripts in an
automated fashion. This commit passes a fake tmpdir to the env script to
avoid creation.

closes elastic#34445

distribution/src/bin/elasticsearch-cli

@@ -2,6 +2,8 @@
 
 set -e -o pipefail
 
+# set tempdir to non empty string so env script does not create it, as it is not used here
+ES_TMPDIR="notused"
 source "`dirname "$0"`"/elasticsearch-env
 
 IFS=';' read -r -a additional_sources <<< "$ES_ADDITIONAL_SOURCES"

distribution/src/bin/elasticsearch-cli.bat

@@ -1,3 +1,6 @@
+
+rem set tempdir to non empty string so env script does not create it, as it is not used here
+set ES_TMPDIR="notused"
 call "%~dp0elasticsearch-env.bat" || exit /b 1
 
 if defined ES_ADDITIONAL_SOURCES (