Fix checkstyle unused imports and update compressed bulk request size expectations

Remove unused imports (ScriptConfiguration, HashMap, Map) from
OpenSearchSink. Update expected compressed bulk request sizes in
integration tests to account for the additional resolvedScriptParameters
field in SerializedJsonImpl.

Signed-off-by: Dinu John <86094133+dinujoh@users.noreply.github.com>

Author: dinujoh

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

@@ -529,7 +529,7 @@ void testOutputRawSpanDefault(final boolean estimateBulkSizeUsingCompression,
                         .add(OpenSearchSink.BULKREQUEST_SIZE_BYTES).toString());
         assertThat(bulkRequestSizeBytesMetrics.size(), equalTo(3));
         assertThat(bulkRequestSizeBytesMetrics.get(0).getValue(), closeTo(1.0, 0));
-        final double expectedBulkRequestSizeBytes = isRequestCompressionEnabled && estimateBulkSizeUsingCompression ? 799.0 : 2058.0;
+        final double expectedBulkRequestSizeBytes = isRequestCompressionEnabled && estimateBulkSizeUsingCompression ? 830.0 : 2058.0;
         assertThat(bulkRequestSizeBytesMetrics.get(1).getValue(), closeTo(expectedBulkRequestSizeBytes, 0));
         assertThat(bulkRequestSizeBytesMetrics.get(2).getValue(), closeTo(expectedBulkRequestSizeBytes, 0));
     }
@@ -615,7 +615,7 @@ void testOutputRawSpanWithDLQ(final boolean estimateBulkSizeUsingCompression,
                         .add(OpenSearchSink.BULKREQUEST_SIZE_BYTES).toString());
         assertThat(bulkRequestSizeBytesMetrics.size(), equalTo(3));
         assertThat(bulkRequestSizeBytesMetrics.get(0).getValue(), closeTo(1.0, 0));
-        final double expectedBulkRequestSizeBytes = isRequestCompressionEnabled && estimateBulkSizeUsingCompression ? 1085.0 : 2072.0;
+        final double expectedBulkRequestSizeBytes = isRequestCompressionEnabled && estimateBulkSizeUsingCompression ? 1114.0 : 2072.0;
         assertThat(bulkRequestSizeBytesMetrics.get(1).getValue(), closeTo(expectedBulkRequestSizeBytes, 0));
         assertThat(bulkRequestSizeBytesMetrics.get(2).getValue(), closeTo(expectedBulkRequestSizeBytes, 0));
 
@@ -677,7 +677,7 @@ void testOutputServiceMapDefault(final boolean estimateBulkSizeUsingCompression,
                         .add(OpenSearchSink.BULKREQUEST_SIZE_BYTES).toString());
         assertThat(bulkRequestSizeBytesMetrics.size(), equalTo(3));
         assertThat(bulkRequestSizeBytesMetrics.get(0).getValue(), closeTo(1.0, 0));
-        final double expectedBulkRequestSizeBytes = isRequestCompressionEnabled && estimateBulkSizeUsingCompression ? 376.0 : 265.0;
+        final double expectedBulkRequestSizeBytes = isRequestCompressionEnabled && estimateBulkSizeUsingCompression ? 410.0 : 265.0;
         assertThat(bulkRequestSizeBytesMetrics.get(1).getValue(), closeTo(expectedBulkRequestSizeBytes, 0));
         assertThat(bulkRequestSizeBytesMetrics.get(2).getValue(), closeTo(expectedBulkRequestSizeBytes, 0));
 

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

@@ -61,7 +61,6 @@
 import org.opensearch.dataprepper.plugins.sink.opensearch.bulk.JavaClientAccumulatingUncompressedBulkRequest;
 import org.opensearch.dataprepper.plugins.sink.opensearch.bulk.SerializedJson;
 import org.opensearch.dataprepper.plugins.sink.opensearch.configuration.ActionConfiguration;
-import org.opensearch.dataprepper.plugins.sink.opensearch.configuration.ScriptConfiguration;
 import org.opensearch.dataprepper.plugins.sink.opensearch.configuration.DlqConfiguration;
 import org.opensearch.dataprepper.plugins.sink.opensearch.configuration.OpenSearchSinkConfig;
 import org.opensearch.dataprepper.plugins.sink.opensearch.dlq.FailedBulkOperation;
@@ -91,10 +90,8 @@
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
-import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
-import java.util.Map;
 import java.util.Objects;
 import java.util.Optional;
 import java.util.Set;