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"None of these libraries (or many others) have competing implementations written in other languages."

Except the ones they were written to copy. Each example you give is an open-sourced clone of an pre-existing version implemented in a different language.

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That's not true at all, Lucene is a Java project from the beginning, and has since been copied to virtually every other environment because it is such a kick-ass indexing engine.

So in no way did they copy Google's which is implemented in C++ ?

Though I agree with OP - these projects and Java are here to stay for the foreseeable future.

No, they didn't copy any of Google's implementation. They simply implemented efficiently the TF-IDF based document retrieval model.

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