Update Elasticsearch dependency.

[tmehlinger]

This updates our Elasticsearch dependency in the dependency containers
to mitigate https://www.cve.org/CVERecord?id=CVE-2021-44228.

[Zozman]

The same Docker update needs to be done on

mindmeld/docker_containers/mindmeld_docker/Dockerfile

Lines 13 to 14 in 1ff40df

	ENV ES_PKG_NAME elasticsearch-7.8.0-linux-x86_64
	ENV ES_FOLDER_NAME elasticsearch-7.8.0

as well, right?

[serapio]

We should fix references in the docs too https://github.com/cisco/mindmeld/blob/master/source/userguide/getting_started.rst#1-install-prerequisites

[tmehlinger]

@serapio Agree, we should put a note there about pulling down the latest. However, we also need to update the mindmeldworkbench/dep image referred to there. Could someone point me to where/how we push updates to that image?

[tmehlinger]

Presently failing because I updated the code to use the latest ES releases... which don't have corresponding Docker images yet. I'll check again later.

[vrdn-23]

@tmehlinger The docker builds seem to be available now.
https://www.docker.elastic.co/r/elasticsearch
Do you want me to take a look at this issue?

[tmehlinger]

Man, I've been living under a rock. I'd be thrilled if you look into this. :D

[Zozman]

Man, I've been living under a rock. I'd be thrilled if you look into this. :D

Saw this and actually have some work on it so went ahead and filed #425 if y'all are interested.