Make field and methods static

src/main/java/at/ac/uibk/gitsearch/repository/search/MetaDataRepository.java

@@ -11,7 +11,6 @@ import java.util.Set;
 import java.util.StringTokenizer;
 import java.util.TreeMap;
 import java.util.stream.Collectors;
-import java.util.stream.Stream;
 
 import org.apache.commons.lang3.StringUtils;
 import org.elasticsearch.action.search.SearchRequest;
@@ -75,7 +74,7 @@ public class MetaDataRepository {
 
 	private final ApplicationProperties properties;
 
-	private final int FRAGMENT_SIZE = 5000;
+	private static final int FRAGMENT_SIZE = 5000;
 
 	public MetaDataRepository(RestHighLevelClient elasticsearchClient, ApplicationProperties properties) {
 		this.elasticsearchClient = elasticsearchClient;
@@ -180,7 +179,7 @@ public class MetaDataRepository {
 		}
 	}
 
-	private void addTo(Map<String, Set<String>> completionMap, List<String> tokenList, String target) {
+	private static void addTo(Map<String, Set<String>> completionMap, List<String> tokenList, String target) {
 		tokenList.forEach(token -> {
 			Set<String> existingTargets = completionMap.get(token);
 			if(existingTargets == null) {
@@ -193,7 +192,7 @@ public class MetaDataRepository {
 
 
 
-	private List<String> split(String s) {
+	private static List<String> split(String s) {
 		StringTokenizer st = new StringTokenizer(s, " \t\n\r\f ");
 		List<String> result = new ArrayList<>();
 		while (st.hasMoreTokens()) {