[CI] compilation error `:elasticsearch-spark:compileTestScala`

[andreidan]

Issue description

Description
https://elasticsearch-ci.elastic.co/job/elastic+elasticsearch-hadoop+8.0+periodic/55/console

Task :elasticsearch-spark:compileTestScala FAILED
... elastic-elasticsearch-hadoop-8.0-periodic/spark/core/src/test/scala/org/elasticsearch/spark/serialization/ScalaValueReaderTest.scala:26:90: not found: value DATE_NANOS
... elastic-elasticsearch-hadoop-8.0-periodic/spark/core/src/test/scala/org/elasticsearch/spark/serialization/ScalaValueReaderTest.scala:31:62: not found: value DATE_NANOS
...

Steps to reproduce

./gradlew :elasticsearch-spark:compileTestScala

[masseyke]

This one ought to be good now. I had forgotten when I cherry-picked the date_nanos fix that it had been done in two parts. We're going to get builds on pull requests soon so this will stop being a problem.