docs: add Elastic as user (#4369)
docs: add Elastic as user (#4369)

* docs: adds Elastic as a user

* docs: wording
testcontainers/testcontainers-java,testcontainers/testcontainers-java,rnorth/test-containers,testcontainers/testcontainers-java,rnorth/test-containers,rnorth/test-containers