@JsonProperty("lookup_regions")
    public abstract String lookupRegions();
@Test
    public void lookupRegions() throws Exception {
        final AWSPluginConfiguration config = createDefault()
                .toBuilder()
                .lookupRegions("us-west-1,eu-west-1 ,  us-east-1 ")
                .build();

        assertThat(config.getLookupRegions()).containsExactly(Regions.US_WEST_1, Regions.EU_WEST_1, Regions.US_EAST_1);
    }