Extent the applicability of indexes to files that have record length fields.

Author: yruslan

cobol-parser/src/main/scala/za/co/absa/cobrix/cobol/reader/VarLenNestedReader.scala

@@ -99,7 +99,7 @@ class VarLenNestedReader[T: ClassTag](copybookContents: Seq[String],
 
   override def getRecordSize: Int = cobolSchema.copybook.getRecordSize
 
-  override def isIndexGenerationNeeded: Boolean = (readerProperties.lengthFieldExpression.isEmpty || readerProperties.isRecordSequence) && readerProperties.isIndexGenerationNeeded
+  override def isIndexGenerationNeeded: Boolean = readerProperties.isIndexGenerationNeeded
 
   override def isRdwBigEndian: Boolean = readerProperties.isRdwBigEndian