Revert change in SearchShardsRequest

Author: julian-elastic

server/src/main/java/org/elasticsearch/action/search/SearchShardsRequest.java

@@ -16,7 +16,6 @@
 import org.elasticsearch.common.io.stream.StreamInput;
 import org.elasticsearch.common.io.stream.StreamOutput;
 import org.elasticsearch.core.Nullable;
-import org.elasticsearch.index.query.MatchAllQueryBuilder;
 import org.elasticsearch.index.query.QueryBuilder;
 import org.elasticsearch.tasks.Task;
 import org.elasticsearch.tasks.TaskId;