[Test] Remove unused imports

Checkstyle

client/rest-high-level/src/test/java/org/elasticsearch/client/documentation/RollupDocumentationIT.java

@@ -57,16 +57,11 @@ import org.elasticsearch.client.rollup.job.config.RollupJobConfig;
 import org.elasticsearch.client.rollup.job.config.TermsGroupConfig;
 import org.elasticsearch.cluster.health.ClusterHealthStatus;
 import org.elasticsearch.common.unit.TimeValue;
-import org.elasticsearch.common.xcontent.support.XContentMapValues;
 import org.elasticsearch.rest.RestStatus;
 import org.elasticsearch.search.aggregations.bucket.histogram.DateHistogramInterval;
-import org.junit.After;
 import org.junit.Before;
 
-import java.io.BufferedReader;
 import java.io.IOException;
-import java.io.InputStreamReader;
-import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
@@ -75,7 +70,6 @@ import java.util.Map;
 import java.util.concurrent.CountDownLatch;
 import java.util.concurrent.TimeUnit;
 
-import static org.apache.lucene.util.LuceneTestCase.AwaitsFix;
 import static org.elasticsearch.common.xcontent.XContentFactory.jsonBuilder;
 import static org.hamcrest.Matchers.equalTo;
 import static org.hamcrest.Matchers.hasSize;