Solr Suggestor is not working for sitecore master index

Question

I recently tried solr autosuggest search in my local,

Steps I followed :

1. Added configuration in master in sensoft_master_index\conf\solrconfig.xml

2. Restarted solr8.1 service in services

3. in C# code,

public IEnumerable GetSuggestion(string term) {

        try
        {
            using (var context = ContentSearchManager.GetIndex("sitecore_master_index").CreateSearchContext())
            {
                SolrSuggestQuery query = term;
                var options = new SuggestHandlerQueryOptions
                {
                    Parameters = new SuggestParameters
                    {
                        Count = 3
                    }
                };

                var result = context.Suggest(query, options);

                return result.Suggestions["default"].Suggestions.Select(a => a.Term);
            }
        }
        catch (Exception e)
        {
            System.IO.File.WriteAllText(@"D:\test1.txt", e.ToString());
        }
        return rr;
    }

But I get the below error

SolrNet.Exceptions.SolrConnectionException:

500 36 java.lang.NullPointerException at org.apache.lucene.search.suggest.fst.FSTCompletionLookup.lookup(FSTCompletionLookup.java:273) at org.apache.lucene.search.suggest.Lookup.lookup(Lookup.java:240) at org.apache.solr.spelling.suggest.SolrSuggester.getSuggestions(SolrSuggester.java:243) at org.apache.solr.handler.component.SuggestComponent.process(SuggestComponent.java:264) at org.apache.solr.handler.component.SearchHandler.handleRequestBody(SearchHandler.java:298) at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:199) at org.apache.solr.core.SolrCore.execute(SolrCore.java:2566) at org.apache.solr.servlet.HttpSolrCall.execute(HttpSolrCall.java:756) at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:542) at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:397) at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:343) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1602) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:540) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:146) at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:548) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132) at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:257) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:1588) at org.eclipse.jetty.server.handler.ScopedHandler.nextHandle(ScopedHandler.java:255) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1345) at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:203) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:480) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:1557) at org.eclipse.jetty.server.handler.ScopedHandler.nextScope(ScopedHandler.java:201) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1247) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:144) at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:220) at org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:126) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132) at org.eclipse.jetty.rewrite.handler.RewriteHandler.handle(RewriteHandler.java:335) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:132) at org.eclipse.jetty.server.Server.handle(Server.java:502) at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:364) at org.eclipse.jetty.server.HttpConnection.onFillable(HttpConnection.java:260) at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(AbstractConnection.java:305) at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103) at org.eclipse.jetty.io.ssl.SslConnection$DecryptedEndPoint.onFillable(SslConnection.java:411) at org.eclipse.jetty.io.ssl.SslConnection.onFillable(SslConnection.java:305) at org.eclipse.jetty.io.ssl.SslConnection$2.succeeded(SslConnection.java:159) at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:103) at org.eclipse.jetty.io.ChannelEndPoint$2.run(ChannelEndPoint.java:118) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.runTask(EatWhatYouKill.java:333) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.doProduce(EatWhatYouKill.java:310) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.tryProduce(EatWhatYouKill.java:168) at org.eclipse.jetty.util.thread.strategy.EatWhatYouKill.run(EatWhatYouKill.java:126) at org.eclipse.jetty.util.thread.ReservedThreadExecutor$ReservedThread.run(ReservedThreadExecutor.java:366) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:765) at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedThreadPool.java:683) at java.lang.Thread.run(Thread.java:748) 500 ---> System.Net.WebException: The remote server returned an error: (500) Internal Server Error. at System.Net.HttpWebRequest.GetResponse()
at HttpWebAdapters.Adapters.HttpWebRequestAdapter.GetResponse() at SolrNet.Impl.SolrConnection.GetResponse(IHttpWebRequest request) at SolrNet.Impl.SolrConnection.Get(String relativeUrl, IEnumerable1 parameters) --- End of inner exception stack trace --- at SolrNet.Impl.SolrConnection.Get(String relativeUrl, IEnumerable1 parameters) at Sitecore.ContentSearch.SolrNetExtension.Impl.SolrQueryExecuterEx`1.Execute(SolrSuggestQuery query, SuggestHandlerQueryOptions options) at Sitecore.ContentSearch.SolrProvider.SolrNetIntegration.SolrNetProxy.Suggest(IProviderSearchContext context, SolrSuggestQuery q, SuggestHandlerQueryOptions options) at SenSoftPOC.Controllers.HomeController.GetSuggestion(String term) in D:\AmeexProjects\Sensoft\SenSoftPOC\SenSoftPOC\Controllers\HomeController.cs:line 197

Answer 1

• First of all try to remove dictionaryImpl parameter.

• Second, from my practice, suggester works only with AnalyzingInfixLookupFactory (or without any lookupImpl).

• Third, check whether your fieldtype that you use for suggester has stored="true" in managed schema.

This is an exmaple of working configuration:

 <searchComponent name="suggest" class="solr.SuggestComponent">
    <lst name="suggester">
      <str name="name">mySuggester</str>
      <str name="lookupImpl">AnalyzingInfixLookupFactory</str>
      <str name="field">pagecontent_t</str>
      <str name="suggestAnalyzerFieldType">text_general</str>
      <str name="buildOnStartup">true</str>
    </lst>
  </searchComponent>

Also you can faced issue that you field is unknown and it can be resolved by adding your field in suggester defaults in solrconfig.xml:

  <initParams path="/suggest">
    <lst name="defaults">
      <str name="df">pagebody_t</str>
    </lst>
  </initParams>