Solr 'df' param not specified.

[jitka]

When running

docker-compose -p d7 -f docker-compose.yml -f d7.override.yml up

I found a problem:

dspacesolr        | 2019-07-18 12:28:38.822 ERROR (searcherExecutor-25-thread-1) [   ] o.a.s.h.RequestHandlerBase org.apache.solr.common.SolrException: no field name specified in query and no default specified via 'df' param
dspacesolr        | 	at org.apache.solr.parser.SolrQueryParserBase.checkNullField(SolrQueryParserBase.java:980)
dspacesolr        | 	at org.apache.solr.parser.SolrQueryParserBase.getFieldQuery(SolrQueryParserBase.java:1082)
dspacesolr        | 	at org.apache.solr.parser.QueryParser.MultiTerm(QueryParser.java:593)
dspacesolr        | 	at org.apache.solr.parser.QueryParser.Query(QueryParser.java:142)
dspacesolr        | 	at org.apache.solr.parser.QueryParser.TopLevelQuery(QueryParser.java:131)
dspacesolr        | 	at org.apache.solr.parser.SolrQueryParserBase.parse(SolrQueryParserBase.java:254)
dspacesolr        | 	at org.apache.solr.search.LuceneQParser.parse(LuceneQParser.java:49)
dspacesolr        | 	at org.apache.solr.search.QParser.getQuery(QParser.java:173)
dspacesolr        | 	at org.apache.solr.handler.component.QueryComponent.prepare(QueryComponent.java:160)
dspacesolr        | 	at org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:272)
dspacesolr        | 	at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:199)
dspacesolr        | 	at org.apache.solr.core.SolrCore.execute(SolrCore.java:2551)
dspacesolr        | 	at org.apache.solr.core.QuerySenderListener.newSearcher(QuerySenderListener.java:74)
dspacesolr        | 	at org.apache.solr.core.SolrCore.lambda$getSearcher$17(SolrCore.java:2317)
dspacesolr        | 	at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
dspacesolr        | 	at org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor.lambda$execute$0(ExecutorUtil.java:209)
dspacesolr        | 	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
dspacesolr        | 	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
dspacesolr        | 	at java.base/java.lang.Thread.run(Thread.java:834)

Even thought, dspace starts up and search function works.