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Elasticsearch for Apache Hadoop version 8.0.0-rc2

Elasticsearch for Apache Hadoop version 8.0.0-rc2

Breaking changes

Deprecate support for Spark 1.x, Scala 2.10 on Spark 2.x, Hadoop 1, Pig, and Storm #1845

Enhancements

Build

Get rid of direct cross-project dependencies to avoid gradle warnings #1868

Core

Avoid failure when using frozen indices #1842

Bug fixes

Core

Fix support for empty and null arrays #1827

MapReduce

Fix docsReceived counter #1840

REST

Check for invalid characters in X-Opaque-ID headers #1873

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