tried to boost sapi query with termid, do not work

web/modules/custom/materio_sapi/materio_sapi.module

@@ -6,7 +6,8 @@
  */
 
 use Drupal\Core\Routing\RouteMatchInterface;
-
+use Solarium\QueryType\Select\Query\Query;
+use Drupal\search_api\Query\QueryInterface;
 /**
  * Implements hook_help().
  */
@@ -22,3 +23,28 @@ function materio_sapi_help($route_name, RouteMatchInterface $route_match) {
     default:
   }
 }
+
+/**
+ * Implements hook_search_api_solr_query_alter();
+ */
+function materio_sapi_search_api_solr_query_alter(Query $solarium_query,  QueryInterface $query) {
+  if ($termid = (int)$query->getOption('termid')) {
+    // get solarium fileds name
+    $index = $query->getIndex();
+    $solrFields = $index->getServerInstance()
+      ->getBackend()
+      ->getSolrFieldNames($index);
+
+    // tag_tid"itm_tag_tid"
+    // thesaurus_tid"itm_thesaurus_tid"
+    $tag_fname = $solrFields['tag_tid'];
+    $thes_fname = $solrFields['thesaurus_tid'];
+    // $solarium_query->addParam('bf', "recip(abs(ms(NOW,{$solrField})),3.16e-11,10,0.1)");
+    // $bfparam = "if(or(gt(termfreq({$tag_fname},{$termid}),0),gt(termfreq({$thes_fname},{$termid}),0)),^21,0)";
+    $bfparam = "if(or(exists(query({$tag_fname}:{$termid})),exists(query({$thes_fname}:{$termid}))),^21,0)";
+    // boost=if(or(exists(query(itm_tag_tid:396)),exists(query(itm_thesaurus_tid:396))),^21,0 )
+    $solarium_query->addParam('boost', $bfparam);
+    // $solarium_query->addParam('debugQuery', 'on');
+  }
+
+}