Maven依赖版本冲突：Elasticsearch和Lucene

Question

My application uses Elasticsearch's transport client to connect to ES 1.7.2 cluster. As per the documentation , it uses Lucene 4.10.4, so below are the dependency versions in my application:

Elasticsearch : 1.7.2
Lucene : 4.10.4

Now, I want to use a lucene based library ( here ) to perform in memory percolation. Looking into the pom.xml of this, it seems it uses Lucene 6.3.0 libraries. So, after adding this dependency, my application does not start up as Elasticsearch needs Lucene 4.10.4 and maven overrides it with 6.3.0, I have tried the following options:

• Searched for the earlier version of percolation library that is compatible with Lucene 4.10.4 - no success
• Tried making elasticsearch work with Lucene 6.3.0 - no success. I can try updating elasticsearch dependency version but my app won't be able to connect to 1.7.2 cluster with new version (also, I can't upgrade the cluster).

Any other options?

Answer 1

You can try to exclude the dependency on lucene on your other library and hope that it works with version 4.x.

in your maven pom, do

<dependency>
  <groupId>com.github.flaxsearch</groupId>
  <artifactId>luwak</artifactId>
  <version>1.4.0</version>
  <exclusions>
     <exclusion>
        <groupId>[the lucene lib group]</groupId>
        <artifactId>[the lucene lib artifact]</artifactId>
     </exclusion>
   </exclusions>
</dependency>

Technically, that's the way to solve version conflicts. But there's no guarantee that the application can be built.