aeron-client/src/main/java/io/aeron/ChannelUri.java
public String entityTag()
    {
        return (null != tags && tags.length > ENTITY_TAG_INDEX) ? tags[ENTITY_TAG_INDEX] : null;
    }
public String entityTag()
    {
        return (null != tags && tags.length > ENTITY_TAG_INDEX) ? tags[ENTITY_TAG_INDEX] : null;
    }
Get the entity tag, if it exists, that refers to an entity such as subscription or publication.

@return entity tag if it exists or null if not in this URI.
@see CommonContext#TAGS_PARAM_NAME
@see CommonContext#TAG_PREFIX