Error: RuntimeException: Could not retrieve available indexes from solr: Couldn't initialize a HttpClusterStateProvider (is/are the Solr server(s), [http://solr-kamala-prod:8983/solr], down?)

java.lang.RuntimeException: Could not retrieve available indexes from solr: Couldn't initialize a HttpClusterStateProvider (is/are the Solr server(s), [http://solr-kamala-prod:8983/solr], down?)
	at nl.mssm.kamala.solr.impl.topicmaps.RemoteTopicmapsSolrManager.getAvailableIndexes(RemoteTopicmapsSolrManager.java:72)
	at nl.mssm.kamala.cloud.solr.CloudSolrManager.getAvailableIndexes(CloudSolrManager.java:76)
	at nl.mssm.kamala.cloud.solr.utils.CloudSolrUtils.doesCoreExist(CloudSolrUtils.java:18)
	at nl.mssm.kamala.cloud.solr.utils.SolrCoreExistsTag.doStartTag(SolrCoreExistsTag.java:17)
	at org.apache.jsp.pages.documentation.docs_jsp._jspService(docs_jsp.java:304)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:70)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:623)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:466)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:379)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:327)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:623)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:210)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:154)
	at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:179)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:154)
	at org.apache.catalina.core.ApplicationDispatcher.invoke(ApplicationDispatcher.java:661)
	at org.apache.catalina.core.ApplicationDispatcher.processRequest(ApplicationDispatcher.java:425)
	at org.apache.catalina.core.ApplicationDispatcher.doForward(ApplicationDispatcher.java:357)
	at org.apache.catalina.core.ApplicationDispatcher.forward(ApplicationDispatcher.java:294)
	at org.tuckey.web.filters.urlrewrite.NormalRewrittenUrl.doRewrite(NormalRewrittenUrl.java:195)
	at org.tuckey.web.filters.urlrewrite.RuleChain.handleRewrite(RuleChain.java:159)
	at org.tuckey.web.filters.urlrewrite.RuleChain.doRules(RuleChain.java:141)
	at org.tuckey.web.filters.urlrewrite.UrlRewriter.processRequest(UrlRewriter.java:90)
	at org.tuckey.web.filters.urlrewrite.UrlRewriteFilter.doFilter(UrlRewriteFilter.java:417)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:179)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:154)
	at nl.mssm.kamala.rest.RedirectToPageFilter.doFilter(RedirectToPageFilter.java:41)
	at nl.mssm.kamala.rest.RedirectToPageFilter.doFilter(RedirectToPageFilter.java:36)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:179)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:154)
	at nl.mssm.kamala.cloud.authz.CloudAuthorizationManagerCacheFilter.doFilter(CloudAuthorizationManagerCacheFilter.java:22)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:179)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:154)
	at nl.mssm.kamala.cloud.authz.CloudLastOnlineFilter.doFilter(CloudLastOnlineFilter.java:39)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:179)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:154)
	at nl.mssm.kamala.utils.OntopiaConnectionCleanupFilter.doFilter(OntopiaConnectionCleanupFilter.java:30)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:179)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:154)
	at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:61)
	at org.apache.shiro.web.servlet.AdviceFilter.executeChain(AdviceFilter.java:108)
	at org.apache.shiro.web.servlet.AdviceFilter.doFilterInternal(AdviceFilter.java:137)
	at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:154)
	at org.apache.shiro.web.servlet.ProxiedFilterChain.doFilter(ProxiedFilterChain.java:66)
	at org.apache.shiro.web.servlet.AbstractShiroFilter.executeChain(AbstractShiroFilter.java:458)
	at org.apache.shiro.web.servlet.AbstractShiroFilter$1.call(AbstractShiroFilter.java:373)
	at org.apache.shiro.subject.support.SubjectCallable.doCall(SubjectCallable.java:90)
	at org.apache.shiro.subject.support.SubjectCallable.call(SubjectCallable.java:83)
	at org.apache.shiro.subject.support.DelegatingSubject.execute(DelegatingSubject.java:387)
	at org.apache.shiro.web.servlet.AbstractShiroFilter.doFilterInternal(AbstractShiroFilter.java:370)
	at org.apache.shiro.web.servlet.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:154)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:179)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:154)
	at nl.mssm.kamala.rest.RedirectToPageFilter.doFilter(RedirectToPageFilter.java:45)
	at nl.mssm.kamala.rest.RedirectToPageFilter.doFilter(RedirectToPageFilter.java:36)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:179)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:154)
	at nl.mssm.kamala.rest.KamalaContextFilter.filterWithKamala(KamalaContextFilter.java:23)
	at nl.mssm.kamala.rest.KamalaContextFilter.doFilter(KamalaContextFilter.java:16)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:179)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:154)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:168)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90)
	at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:481)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:130)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93)
	at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:670)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:346)
	at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:390)
	at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63)
	at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:928)
	at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1786)
	at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52)
	at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
	at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
	at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:63)
	at java.base/java.lang.Thread.run(Thread.java:829)
Caused by: java.lang.RuntimeException: Couldn't initialize a HttpClusterStateProvider (is/are the Solr server(s), [http://solr-kamala-prod:8983/solr], down?)
	at org.apache.solr.client.solrj.impl.CloudHttp2SolrClient$Builder.build(CloudHttp2SolrClient.java:426)
	at nl.mssm.kamala.solr.impl.topicmaps.RemoteTopicmapsSolrManager.createSolrClient(RemoteTopicmapsSolrManager.java:56)
	at nl.mssm.kamala.solr.impl.topicmaps.RemoteTopicmapsSolrManager.getAvailableIndexes(RemoteTopicmapsSolrManager.java:67)
	... 78 more
Caused by: org.apache.solr.client.solrj.impl.BaseHttpSolrClient$RemoteSolrException: Error from server at http://solr-kamala-prod:8983/solr/admin/collections?action=CLUSTERSTATUS&wt=javabin&version=2: Expected mime type in [application/octet-stream, application/vnd.apache.solr.javabin] but got text/html. <p>
  Searching for Solr?<br/>
  You must type the correct path.<br/>
  Solr will respond.
</p>

	at org.apache.solr.client.solrj.impl.Http2SolrClient.checkContentType(Http2SolrClient.java:974)
	at org.apache.solr.client.solrj.impl.Http2SolrClient.processErrorsAndResponse(Http2SolrClient.java:863)
	at org.apache.solr.client.solrj.impl.Http2SolrClient.processErrorsAndResponse(Http2SolrClient.java:576)
	at org.apache.solr.client.solrj.impl.Http2SolrClient.request(Http2SolrClient.java:533)
	at org.apache.solr.client.solrj.SolrClient.request(SolrClient.java:1192)
	at org.apache.solr.client.solrj.impl.BaseHttpClusterStateProvider.fetchLiveNodes(BaseHttpClusterStateProvider.java:227)
	at org.apache.solr.client.solrj.impl.BaseHttpClusterStateProvider.init(BaseHttpClusterStateProvider.java:63)
	at org.apache.solr.client.solrj.impl.Http2ClusterStateProvider.<init>(Http2ClusterStateProvider.java:32)
	at org.apache.solr.client.solrj.impl.CloudHttp2SolrClient$Builder.build(CloudHttp2SolrClient.java:424)
	... 80 more