logic: implemented interrupting AST visiting of Java indexer

* also reverting names of unsolved symbols and unsolved types

java_indexer/src/main/java/com/sourcetrail/JavaIndexerAstVisitorClient.java

@@ -11,6 +11,12 @@ public class JavaIndexerAstVisitorClient extends AstVisitorClient
 		m_address = address;
 	}
 	
+	@Override
+	public boolean getInterrupted()
+	{
+		return JavaIndexer.getInterrupted(m_address);
+	}
+	
 	@Override
 	public void logInfo(String info)
 	{