Connection to ElasticSearch running inside Docker fails (MacOS)

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I am running lbry-sdk integration tests locally on MacOS, with elastic-search inside Docker. I used the lbry-sdk/Makefile command to launch it:

```
elastic-docker:
docker run -d -v lbryhub:/usr/share/elasticsearch/data -p 9200:9200 -p 9300:9300 -e"ES_JAVA_OPTS=-Xms512m -Xmx512m" -e "discovery.type=single-node" docker.elastic.co/elasticsearch/elasticsearch:7.12.1
```

In order to connect herald -> elastic-search, I had to disable the SetSniff() option.

```
diff --git a/server/server.go b/server/server.go
index 415b728..7706e72 100644
--- a/server/server.go
+++ b/server/server.go
@@ -210,7 +210,7 @@ func MakeHubServer(ctx context.Context, args *Args) *Server {
if !args.DisableEs {
esUrl := args.EsHost + ":" + args.EsPort
opts := []elastic.ClientOptionFunc{
- elastic.SetSniff(true),
+ elastic.SetSniff(false),
elastic.SetSnifferTimeoutStartup(time.Second * 60),
elastic.SetSnifferTimeout(time.Second * 60),
elastic.SetURL(esUrl),
```

Probably the clearest explanation:
https://github.com/olivere/elastic/issues/1138

More similar issues:
https://github.com/olivere/elastic/issues?q=is%3Aissue+docker+SetSniff+SetHealthCheck

***Making a --nosniff option MAY NOT be the best solution here.*** I found the following comment describes how to fix this using the ```network.publish_host``` option of ElasticSearch. https://github.com/olivere/elastic/issues/824#issuecomment-474416267

Example:
docker run --env network.publish_host=127.0.0.1 ...

***I tested "--env network.publish_host=127.0.0.1" and it worked for me.***

https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-network.html#advanced-network-settings

Symbolic addresses like ```network.publish_host=_local_``` are supported.

https://www.elastic.co/guide/en/elasticsearch/reference/current/modules-network.html#network-interface-values

Start with server/server.go and the elastic-docker target in Makefile, then trace how the Elastic client uses SetSniff when connecting to the Dockerized Elasticsearch instance. Reproduce the MacOS integration-test setup and compare the reported sniffer and network.publish_host behaviors. Done means the connection works through the documented setup without a local source change or an unexplained workaround.

Written by the indexing model from the issue text.