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If you plan to use the (optional) Elasticsearch Usage Statistics feature in DSpace, the ElasticSearch backend provides its own recommendations regarding Java version.

http://www.elasticsearch.org/guide/en/elasticsearch/reference/current/setup.html

"Elasticsearch is built using Java, and requires at least Java 7 in order to run. Only Oracle’s Java and the OpenJDK are supported. We recommend installing the Java 8 update 20 or later, or Java 7 update 55 or later. Previous versions of Java 7 are known to have bugs that can cause index corruption and data loss."

(However, if you plan to use the default Solr-based Usage Statistics that come with are enabled by default within DSpace, you can ignore these additional requirements.)