在SBT Assembly MergeStrategy中包含特定文件

Question

使用重复数据删除策略时，这是我收到的错误：

[error] deduplicate: different file contents found in the following:
[error] C:\Users\me\.ivy2\cache\org.neo4j\neo4j-kernel\jars\neo4j-kernel-3.2.3.jar:META-INF/services/org.neo4j.kernel.extension.KernelExtensionFactory
[error] C:\Users\me\.ivy2\cache\org.neo4j\neo4j-lucene-index\jars\neo4j-lucene-index-3.2.3.jar:META-INF/services/org.neo4j.kernel.extension.KernelExtensionFactory
[error] C:\Users\me\.ivy2\cache\org.neo4j\neo4j-udc\jars\neo4j-udc-3.2.3.jar:META-INF/services/org.neo4j.kernel.extension.KernelExtensionFactory
[error] C:\Users\me\.ivy2\cache\org.neo4j\neo4j-jmx\jars\neo4j-jmx-3.2.3.jar:META-INF/services/org.neo4j.kernel.extension.KernelExtensionFactory

我需要的文件是列表中的第二个文件：neo4j-lucene-index\jars\neo4j-lucene-index-3.2.3.jar:META-INF/services/org.neo4j.kernel.extension.KernelExtensionFactory，但是第二个SBT程序集中没有MergeStrategy，只有“第一个”和“最后一个”。

这是我当前正在使用的合并策略：

 assemblyMergeStrategy in assembly := {
    case PathList("META-INF", "MANIFEST.MF") => MergeStrategy.discard
    case PathList("META-INF", "LICENSES.txt") => MergeStrategy.discard
    case PathList("META-INF", "services", "org.neo4j.kernel.extension.KernelExtensionFactory") => MergeStrategy.first
    case PathList("META-INF", xs @ _*) =>
      (xs map {_.toLowerCase}) match {
    case ps @ (x :: xs) if ps.last.endsWith(".sf") || ps.last.endsWith(".dsa") || ps.last.endsWith(".rsa") =>
          MergeStrategy.discard
    case x => MergeStrategy.deduplicate
    }
  case x => MergeStrategy.deduplicate
}

如何为列表中的第二个创建自定义合并策略，或告诉SBT包含特定文件？