Error 503 {metadata={error-class=org.apache.solr.common.SolrException,root-error-class=org.apache.solr.common.SolrException},msg=SolrCore is loading,code=503}

Unsuccessful query request : Response Code 503. Error 503 {metadata={error-class=org.apache.solr.common.SolrException,root-error-class=org.apache.solr.common.SolrException},msg=SolrCore is loading,code=503}

HTTP ERROR 503

Problem accessing /solr/fs/select/. Reason:

    {metadata={error-class=org.apache.solr.common.SolrException,root-error-class=org.apache.solr.common.SolrException},msg=SolrCore is loading,code=503}