Index backwards compatibility

[Michael Wechner]

Hi

I am using Lucene 8.8.2 in production and I am currently doing some 
tests using 9.0.0-SNAPSHOT, whereas I have included 
lucene-backward-codecs, because in the log files it was asking me 
whether I have forgotten to include lucene-backward-codecs.jar

        <dependency>
            <groupId>org.apache.lucene</groupId>
            <artifactId>lucene-core</artifactId>
            <version>9.0.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>org.apache.lucene</groupId>
            <artifactId>lucene-queryparser</artifactId>
            <version>9.0.0-SNAPSHOT</version>
        </dependency>
        <dependency>
            <groupId>org.apache.lucene</groupId>
<artifactId>lucene-backward-codecs</artifactId>
            <version>8.8.2</version>
        </dependency>

But when querying index directories created with Lucene 8.8.2, then I 
receive the following error

java.lang.NoClassDefFoundError: Could not initialize class 
org.apache.lucene.codecs.Codec$Holder

I am not sure whether I understand the backwards compatibility page 
correctly

https://cwiki.apache.org/confluence/display/LUCENE/BackwardsCompatibility

but I guess version 9 will not be backwards compatible to version 8? Or 
should I do something different?

Thanks

Michael

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