@PipelineProperty(
            description = "Set the key name pattern if you want to override the one provided by the S3 config.",
            defaultValue = "${type}/${year}/${month}/${day}/${idPath}/${feed}/${idPadded}.gz",
            displayPriority = 3)
    public void setKeyNamePattern(final String keyNamePattern) {
        this.keyNamePattern = keyNamePattern;
    }
Joins text instances into a single text instance.
stroom-aws/stroom-aws-s3-impl/src/main/java/stroom/aws/s3/impl/S3Appender.java