public EsIndexBuilder setRootEntryMap(
            Map<String, AllowableRootEntry> rootEntryMap) {
            this.rootEntryMap = rootEntryMap;
            return this;
        }
Set the whole root entry map (unless you are doing something custom, you probably don't want this)
common/es/src/main/java/io/apiman/common/es/util/builder/index/EsIndex.java