Cleanup for linter

Signed-off-by: Jonah Calvo <caljonah@amazon.com>

Author: Jonah Calvo

data-prepper-plugins/opensearch/src/integrationTest/java/org/opensearch/dataprepper/plugins/sink/opensearch/OpenSearchSinkIT.java

@@ -47,15 +47,11 @@
 import org.opensearch.dataprepper.model.plugin.PluginConfigObservable;
 import org.opensearch.dataprepper.model.record.Record;
 import org.opensearch.dataprepper.model.sink.SinkContext;
-import org.opensearch.dataprepper.plugins.sink.opensearch.BulkRetryStrategy;
 import org.opensearch.dataprepper.plugins.sink.opensearch.configuration.OpenSearchSinkConfig;
-import org.opensearch.dataprepper.plugins.sink.opensearch.ConnectionConfiguration;
-import org.opensearch.dataprepper.plugins.sink.opensearch.DistributionVersion;
 import org.opensearch.dataprepper.plugins.sink.opensearch.index.AbstractIndexManager;
 import org.opensearch.dataprepper.plugins.sink.opensearch.index.IndexConfiguration;
 import org.opensearch.dataprepper.plugins.sink.opensearch.index.IndexConstants;
 import org.opensearch.dataprepper.plugins.sink.opensearch.index.IndexType;
-import org.opensearch.dataprepper.plugins.sink.opensearch.RetryConfiguration;
 
 import javax.ws.rs.HttpMethod;
 import java.io.BufferedReader;

data-prepper-plugins/opensearch/src/main/java/org/opensearch/dataprepper/plugins/sink/opensearch/index/DataStreamDetector.java

@@ -17,7 +17,6 @@
 import org.slf4j.LoggerFactory;
 
 import java.io.IOException;
-import java.util.concurrent.ConcurrentHashMap;
 
 /**
  * Utility class to detect if an index name refers to a Data Stream

data-prepper-plugins/opensearch/src/test/java/org/opensearch/dataprepper/plugins/sink/opensearch/index/DataStreamIndexTest.java

@@ -80,7 +80,7 @@ void ensureTimestamp_setsTimestamp_whenDataStreamAndTimestampMissing() {
 
         dataStreamIndex.ensureTimestamp(event, "my-data-stream");
 
-        verify(event).put("@timestamp", testTime);
+        verify(event).put("@timestamp", testTime.toEpochMilli());
     }
 
     @Test