@Override
    public boolean equals(Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        FederationTarget that = (FederationTarget) o;

        if (!chain.equals(that.chain)) return false;
        if (customData != null ? !customData.equals(that.customData) : that.customData != null) return false;
        if (!federationOptions.equals(that.federationOptions)) return false;

        return true;
    }
Any data that the TargetSelector wants to associate with this target.
Owned exclusively by the TargetSelector that created this instance.
container-search/src/main/java/com/yahoo/search/federation/selection/FederationTarget.java