Remove test fixture old-elasticsearch (#18060)

This appears to be unused and was only relevant for very old versions of
Elasticsearch.

Signed-off-by: Andrew Ross <andrross@amazon.com>

Author: andrross

.github/dependabot.yml

@@ -1403,14 +1403,6 @@ updates:
     labels:
       - "dependabot"
       - "dependencies"
-  - directory: /test/fixtures/old-elasticsearch/
-    open-pull-requests-limit: 1
-    package-ecosystem: gradle
-    schedule:
-      interval: weekly
-    labels:
-      - "dependabot"
-      - "dependencies"
   - directory: /test/fixtures/s3-fixture/
     open-pull-requests-limit: 1
     package-ecosystem: gradle

gradle/missing-javadoc.gradle

@@ -157,7 +157,6 @@ configure([
   project(":test:fixtures:azure-fixture"),
   project(":test:fixtures:gcs-fixture"),
   project(":test:fixtures:hdfs-fixture"),
-  project(":test:fixtures:old-elasticsearch"),
   project(":test:fixtures:s3-fixture"),
   project(":test:framework"),
   project(":test:logger-usage")

settings.gradle

@@ -83,7 +83,6 @@ List projects = [
   'test:fixtures:hdfs-fixture',
   'test:fixtures:krb5kdc-fixture',
   'test:fixtures:minio-fixture',
-  'test:fixtures:old-elasticsearch',
   'test:fixtures:s3-fixture',
   'test:logger-usage',
   'test:telemetry'