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From GitBox <...@apache.org>
Subject [GitHub] [lucenenet] PaulVrugt commented on issue #398: Migrating from lucene.net 3.0 to 4.8
Date Wed, 09 Dec 2020 10:47:59 GMT

PaulVrugt commented on issue #398:
URL: https://github.com/apache/lucenenet/issues/398#issuecomment-741691266


   @NightOwl888  Thanks! That clarifies a lot and solves a lot of migration issues! Might
I ask some follow up questions?
   
   1. we used to create indexwriters by calling:
   `new Index.IndexWriter(_luceneDir, analyzer, False, Index.IndexWriter.MaxFieldLength.UNLIMITED)`
   now I found we need to use the config object instead of separate parameters in the new
situation. So we do somthing like:
   
   ````
   var config = new Index.IndexWriterConfig(Util.LuceneVersion.LUCENE_48, analyzer) {OpenMode
= Index.OpenMode.APPEND}
   New Index.IndexWriter(_luceneDir, config)
   ````
   
   where do we leave the max field length here? Is it still required?
   
   2. Where did the `Optimize` method of the IndexWriter go? Is there any alternative?
   3. We used to use fields like:
       `New Documents.Field("title", "<value>", Documents.Field.Store.YES, Documents.Field.Index.ANALYZED)`
   
       now the obsolete error tells me I need to use `StringField` or `TextField`. Which of
the two do I need to use, and how to I pass 
       the `Store` and `Analyzed` properties to them?
   
   4. The FieldCache `GetStrings` method was replace by `GetTerms`, but `GetTerms` requires
an `AtomicReader`, we used to be able to pass an `IndexReader` into this method and it used
to return a string array containing the values. How to I get the same kind of behavior from
the `GetTerms` method?
   
   Sorry about the interrogation, but we really want to migrate, but the the lack of migration
documentation makes it really hard.


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