[Feature Request]: Elasticsearch 9 support

[kieran-pringle]

What would you like to happen?

There is currently a check for Elasticsearch versions that will reject versions above 8:

beam/sdks/java/io/elasticsearch/src/main/java/org/apache/beam/sdk/io/elasticsearch/ElasticsearchIO.java

Line 208 in 7735e7a

private static final List<Integer> VALID_CLUSTER_VERSIONS = Arrays.asList(5, 6, 7, 8);

I am not confident enough in my Elasticsearch knowledge to know if simply adding 9 to this list is enough.

Issue Priority

Priority: 2 (default / most feature requests should be filed as P2)

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