Document example usage with PySpark

[XQ-UT]

Is your feature request related to a problem?

We have examples for Java/Scala in the usage page.

It will be great if we can have a usage example for PySpark in this page.

What solution would you like?

For elasticsearch usage, it is something like this

    df.write.format("org.elasticsearch.spark.sql").option(
        "es.nodes",
        es_url,
    ).option(
        "es.port", "443"
    ).option("es.nodes.wan.only", "true").option(
        "es.resource",
        es_index,
    ).option(
        "es.write.operation", "upsert"
    ).option(
        "es.mapping.id", "user_id"
    ).mode(
        "append"
    ).save()

Can we have something like this?

[Xtansia]

Hi @XQ-UT, thanks for raising this issue!

There's an example that was provided in a previous question: #153 (comment)

So we basically just need to add this into the USER_GUIDE, if you're so inclined it'd be awesome if you wanted to make a PR contributing the doc update!