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Elasticsearch for Apache Hadoop version 8.0.0-rc1

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Elasticsearch for Apache Hadoop version 8.0.0-rc1

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Enhancements

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Build

Setting Java boot classpath so that Scala 2.10 works on Gradle 7.2 #1800
Build Hadoop with Java 17 #1808
Update Gradle wrapper to 7.3 #1809
Update log4j version #1828

Serialization

Add support for the date_nanos field type #1803

Spark

Add support for Spark 3.1 and 3.2 #1807

Bug fixes

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Spark

Resolve saveToEs saves case classes fields with NULL values #1478
Correctly reading empty fields in as null rather than throwing exception #1816
Setting es.read.fields.include could throw a NullPointerException in older spark version #1822

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