title: RSolr::Error::Http - 500 Internal Server Error
body: <p>I am upgrading solr 5.3.1, I am getting following error when I run specs on <code>semaphoreci</code></p>
  
  <blockquote>
    <p>RSolr::Error::Http:
           RSolr::Error::Http - 500 Internal Server Error
           Error:     {msg=SolrCore &apos;default&apos; is not available due to init failure: Error opening new
    searcher,trace=org.apache.solr.common.SolrException: SolrCore
    &apos;default&apos; is not available due to init failure: Error
    opening new searcher
              at org.apache.solr.core.CoreContainer.getCore(CoreContainer.java:974)
              at org.apache.solr.servlet.HttpSolrCall.init(HttpSolrCall.java:250)
              at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:417)
              at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:214)
              at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:179)
              at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1652)
              at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:585)
              at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:143)
              at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:577)
              at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:223)</p>
  
  <pre><code>   URI: http://localhost:8981/solr/default/update?wt=json
     Request Headers: {"Content-Type"=&gt;"application/json"}
     Request Data: "[{\"id\":\"Contact 1\",\"type\":[\"Contact\",\"ActiveRecord::Base\"],\"class_name\":\"Contact\",\"first_name_text\":\"Danial\",\"last_name_text\":\"Ullrich\"}]"
  
     Backtrace: /home/runner/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rsolr-2.0.2/lib/rsolr/client.rb:195:in
  </code></pre>
    
    <p><code>rescue in execute'
           /home/runner/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rsolr-2.0.2/lib/rsolr/client.rb:185:in
    </code>execute'
           /home/runner/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rsolr-2.0.2/lib/rsolr/client.rb:180:in
    <code>send_and_receive'
           /home/runner/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/sunspot_rails-2.2.7/lib/sunspot/rails/solr_instrumentation.rb:16:in
    </code>block in send_and_receive_with_as_instrumentation'
           /home/runner/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-4.2.7.1/lib/active_support/notifications.rb:164:in
    <code>block in instrument'
           /home/runner/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-4.2.7.1/lib/active_support/notifications/instrumenter.rb:20:in
    </code>instrument'
           /home/runner/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/activesupport-4.2.7.1/lib/active_support/notifications.rb:164:in
    <code>instrument'
           /home/runner/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/sunspot_rails-2.2.7/lib/sunspot/rails/solr_instrumentation.rb:15:in
    </code>send_and_receive_with_as_instrumentation'
           (eval):2:in <code>post'
           /home/runner/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rsolr-2.0.2/lib/rsolr/client.rb:83:in
    </code>update'
           /home/runner/.rbenv/versions/2.3.1/lib/ruby/gems/2.3.0/gems/rsolr-2.0.2/lib/rsolr/client.rb:102:in
    <code>add'
         # (eval):2:in</code>post'
         # ./spec/controllers/contacts_controller_spec.rb:319:in <code>block (3 levels) in &lt;top (required)&gt;'
         # ------------------
         # --- Caused by: ---
         # Faraday::ClientError:
         #   the server responded with status 500
         #   (eval):2:in</code>post'</p>
  </blockquote>
  
  <p><strong>Solr Logs</strong></p>
  
  <pre><code>1152 ERROR (coreLoadExecutor-6-thread-2) [   x:development] o.a.s.c.CoreContainer Error creating core [development]: Index locked for write for core 'development'. Solr now longer supports forceful unlocking via 'unlockOnStartup'. Please verify locks manually!
  org.apache.solr.common.SolrException: Index locked for write for core 'development'. Solr now longer supports forceful unlocking via 'unlockOnStartup'. Please verify locks manually!
    at org.apache.solr.core.SolrCore.&lt;init&gt;(SolrCore.java:820)
    at org.apache.solr.core.SolrCore.&lt;init&gt;(SolrCore.java:659)
    at org.apache.solr.core.CoreContainer.create(CoreContainer.java:723)
    at org.apache.solr.core.CoreContainer$1.call(CoreContainer.java:443)
    at org.apache.solr.core.CoreContainer$1.call(CoreContainer.java:434)
    at java.util.concurrent.FutureTask.run(FutureTask.java:266)
    at org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor$1.run(ExecutorUtil.java:210)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:748)
  Caused by: org.apache.lucene.store.LockObtainFailedException: Index locked for write for core 'development'. Solr now longer supports forceful unlocking via 'unlockOnStartup'. Please verify locks manually!
    at org.apache.solr.core.SolrCore.initIndex(SolrCore.java:528)
    at org.apache.solr.core.SolrCore.&lt;init&gt;(SolrCore.java:761)
  </code></pre>
  
  <p>Any help would be much appreciated. </p>