Description of problem:
Every time I search in eclipse using the "PyDev Search" feature, I get an error.

Version-Release number of selected component (if applicable):
eclipse-pydev-5.4.0-1.fc25.x86_64
eclipse-pydev-5.1.2-1.fc25.x86_64

How reproducible:
always, even on a fresh project with just a single file

Steps to Reproduce:
1. have a workspace with any PyDev project
2. open search (Ctrl+H)
3. search for any term

Actual results:
Always gives an Error

Expected results:
No error

Additional info:


Backtrace on a fresh project:

eclipse.buildId=4.6.1.v20160915-0852
java.version=1.8.0_111
java.vendor=Oracle Corporation
BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=de_DE
Command-line arguments:  -os linux -ws gtk -arch x86_64

org.eclipse.core.jobs
Error
Mon Dec 19 16:51:49 CET 2016
An internal error occurred during: "PyDev Index Search".

java.lang.NoClassDefFoundError: Could not initialize class org.apache.lucene.codecs.Codec$Holder
	at org.apache.lucene.codecs.Codec.getDefault(Codec.java:140)
	at org.apache.lucene.index.LiveIndexWriterConfig.<init>(LiveIndexWriterConfig.java:120)
	at org.apache.lucene.index.IndexWriterConfig.<init>(IndexWriterConfig.java:140)
	at org.python.pydev.shared_core.index.IndexApi.init(IndexApi.java:100)
	at org.python.pydev.shared_core.index.IndexApi.<init>(IndexApi.java:82)
	at org.python.pydev.shared_core.index.IndexApi.<init>(IndexApi.java:95)
	at com.python.pydev.analysis.additionalinfo.ReferenceSearchesLucene.internalSearch(ReferenceSearchesLucene.java:157)
	at com.python.pydev.analysis.additionalinfo.ReferenceSearchesLucene.search(ReferenceSearchesLucene.java:94)
	at com.python.pydev.analysis.search_index.PySearchIndexQuery.run(PySearchIndexQuery.java:84)
	at org.eclipse.search2.internal.ui.InternalSearchUI$InternalSearchJob.run(InternalSearchUI.java:92)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)



Backtrace on an older project:

eclipse.buildId=4.6.1.v20160915-0852
java.version=1.8.0_111
java.vendor=Oracle Corporation
BootLoader constants: OS=linux, ARCH=x86_64, WS=gtk, NL=de_DE
Command-line arguments:  -os linux -ws gtk -arch x86_64

org.eclipse.core.jobs
Error
Mon Dec 19 16:47:34 CET 2016
An internal error occurred during: "PyDev Index Search".

java.lang.ExceptionInInitializerError
	at org.apache.lucene.codecs.PostingsFormat.forName(PostingsFormat.java:112)
	at org.apache.lucene.codecs.lucene54.Lucene54Codec.<init>(Lucene54Codec.java:161)
	at org.apache.lucene.codecs.lucene54.Lucene54Codec.<init>(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.<init>(NamedSPILoader.java:49)
	at org.apache.lucene.util.NamedSPILoader.<init>(NamedSPILoader.java:38)
	at org.apache.lucene.codecs.Codec$Holder.<clinit>(Codec.java:47)
	at org.apache.lucene.codecs.Codec.getDefault(Codec.java:140)
	at org.apache.lucene.index.LiveIndexWriterConfig.<init>(LiveIndexWriterConfig.java:120)
	at org.apache.lucene.index.IndexWriterConfig.<init>(IndexWriterConfig.java:140)
	at org.python.pydev.shared_core.index.IndexApi.init(IndexApi.java:100)
	at org.python.pydev.shared_core.index.IndexApi.<init>(IndexApi.java:82)
	at org.python.pydev.shared_core.index.IndexApi.<init>(IndexApi.java:95)
	at com.python.pydev.analysis.additionalinfo.ReferenceSearchesLucene.internalSearch(ReferenceSearchesLucene.java:157)
	at com.python.pydev.analysis.additionalinfo.ReferenceSearchesLucene.search(ReferenceSearchesLucene.java:94)
	at com.python.pydev.analysis.search_index.PySearchIndexQuery.run(PySearchIndexQuery.java:84)
	at org.eclipse.search2.internal.ui.InternalSearchUI$InternalSearchJob.run(InternalSearchUI.java:92)
	at org.eclipse.core.internal.jobs.Worker.run(Worker.java:55)
Caused by: 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.<init>(NamedSPILoader.java:51)
	at org.apache.lucene.util.NamedSPILoader.<init>(NamedSPILoader.java:38)
	at org.apache.lucene.codecs.PostingsFormat$Holder.<clinit>(PostingsFormat.java:49)
	... 23 more