Use asterisk instead of empty string to clear all cached entries (#63907)#63989

ywangd merged 1 commit intoelastic:7.10elastic/elasticsearch:7.10from

ywangd:es-63885-asterisk-instead-of-empty-string-7.10ywangd/elasticsearch:es-63885-asterisk-instead-of-empty-string-7.10Copy head branch name to clipboard