protected S3ClientOptions resolveS3ClientOptions() {
        final S3ClientOptions.Builder builder = S3ClientOptions.builder();
        if (Boolean.TRUE.equals(this.chunkedEncodingDisabled)) {
            builder.disableChunkedEncoding();
        }
        if (this.payloadSigningEnabled != null) {
            builder.setPayloadSigningEnabled(this.payloadSigningEnabled);
        }
        if (this.accelerateModeEnabled != null) {
            builder.setAccelerateModeEnabled(this.accelerateModeEnabled);
        }
        if (this.pathStyleAccessEnabled != null) {
            builder.setPathStyleAccess(this.pathStyleAccessEnabled);
        }
        if(Boolean.TRUE.equals(this.dualstackEnabled)) {
            builder.enableDualstack();
        }
        if(Boolean.TRUE.equals(this.forceGlobalBucketAccessEnabled)) {
            builder.enableForceGlobalBucketAccess();
        }
        if(Boolean.TRUE.equals(this.useArnRegionEnabled)) {
            builder.enableUseArnRegion();
        }
        if(Boolean.TRUE.equals(this.regionalUsEast1EndpointEnabled)) {
            builder.enableRegionalUsEast1Endpoint();
        }
        return builder.build();
    }
<p>Enables us-east-1 regional mode on clients built with the builder.</p>
@return This object for method chaining.
aws-java-sdk-s3/src/main/java/com/amazonaws/services/s3/AmazonS3Builder.java