Data nodes discovery is broken when using then new data tier roles

[lucabelluccini]

By default, ES-Hadoop uses the following:

es.nodes.wan.only: false
es.nodes.discovery: true
es.nodes.data.only: true

Starting with Elasticsearch 7.10, we have node roles such as data_hot, data_warm, data_content, data_frozen.
The data role is going to be sunset in favor of those roles.

In case ES-Hadoop tries to discover a cluster in search of nodes having the data role, it fails.

The problem is at:

elasticsearch-hadoop/mr/src/main/java/org/elasticsearch/hadoop/serialization/dto/NodeInfo.java

Line 61 in 2a0eec2

this.isClient = roles.contains("data") == false;

[lucabelluccini]

CC @jbaiera

[lucabelluccini]

As a workaround, it's possible to:

1. Set only the data nodes in the es.nodes and set es.nodes.discovery: false
2. Set only the data nodes in the es.nodes and set es.nodes.wan.only: true
3. Set es.nodes.data.only: false

[jbaiera]

Fixed in #1613