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java.lang.ClassCastException: class org.apache.lucene.codecs.lucene50.Lucene50PostingsFormat	at java.lang.Class.asSubclass(Class.java:3404)	at org.apache.lucene.util.SPIClassIterator.next(SPIClassIterator.java:158)	at org.apache.lucene.util.NamedSPILoader.reload(NamedSPILoader.java:70)	at org.apache.lucene.util.NamedSPILoader.(NamedSPILoader.java:51)	at org.apache.lucene.util.NamedSPILoader.(NamedSPILoader.java:38)	at org.apache.lucene.codecs.PostingsFormat$Holder.(PostingsFormat.java:49)	at org.apache.lucene.codecs.PostingsFormat.forName(PostingsFormat.java:112)	at org.apache.lucene.codecs.lucene54.Lucene54Codec.(Lucene54Codec.java:161)	at org.apache.lucene.codecs.lucene54.Lucene54Codec.(Lucene54Codec.java:81)	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)	at java.lang.reflect.Constructor.newInstance(Constructor.java:423)	at java.lang.Class.newInstance(Class.java:442)	at org.apache.lucene.util.NamedSPILoader.reload(NamedSPILoader.java:72)	at org.apache.lucene.util.NamedSPILoader.(NamedSPILoader.java:49)	at org.apache.lucene.util.NamedSPILoader.(NamedSPILoader.java:38)	at org.apache.lucene.codecs.Codec$Holder.(Codec.java:47)	at org.apache.lucene.codecs.Codec.getDefault(Codec.java:140)	at org.apache.lucene.index.LiveIndexWriterConfig.(LiveIndexWriterConfig.java:120)	at org.apache.lucene.index.IndexWriterConfig.(IndexWriterConfig.java:140)	at org.python.pydev.shared_core.index.IndexApi.init(IndexApi.java:100)	at org.python.pydev.shared_core.index.IndexApi.(IndexApi.java:82)	at org.python.pydev.shared_core.index.IndexApi.(IndexApi.java:95)	at com.python.pydev.analysis.additionalinfo.ReferenceSearchesLucene.internalSearch(ReferenceSearchesLucene.java:157)	at com.python.pydev.analysis.additionalinfo.ReferenceSearchesLucene.search(ReferenceSearchesLucene.java:94)	at com.python.pydev.analysis.search_index.PySearchIndexQuery.run(PySearchIndexQuery.java:84)	at org.eclipse.search2.internal.ui.InternalSearchUI$InternalSearchJob.run(InternalSearchUI.java:92)	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)