public static Optional<String> getUserDisplayName(final OpenIdConfiguration openIdConfiguration,
                                                      final JwtClaims jwtClaims) {
        Objects.requireNonNull(openIdConfiguration);
        Objects.requireNonNull(jwtClaims);
        final String userDisplayNameClaim = openIdConfiguration.getUserDisplayNameClaim();
        final Optional<String> userDisplayName = JwtUtil.getClaimValue(jwtClaims, userDisplayNameClaim);

        LOGGER.debug("userDisplayNameClaim: {}, userDisplayName: {}", userDisplayNameClaim, userDisplayName);

        return userDisplayName;
    }
Gets the unique ID that links the identity on the IDP to the stroom_user.
Maps to the 'name' column in stroom_user table.
stroom-security/stroom-security-common-impl/src/main/java/stroom/security/common/impl/JwtUtil.java