I had same issue, in my case i edited /extension/ezfind/java/solr/conf/solrconfig.xml
and I changed two settings in it.
<lockType>single</lockType> to <lockType>simple</lockType>
and <unlockOnStartup>false</unlockOnStartup> to <unlockOnStartup>true</unlockOnStartup>
it should not harm your system, it simply unlocks the files on startup, and changes the lock type. dont forget to restart solr after changes in config
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