3086974 - Missing property groupMergeMode in AsCategoryAwareSearchConfiguration from Adaptive Search will cause search problem

Your search functionality (e.g. autocomplete) is not working as expected, in the meantime, you noticed the following exception in the log:

   "level":"ERROR",
   "loggerName":"de.hybris.platform.commerceservices.search.solrfacetsearch.populators.SolrSearchRequestResponsePopulator",
   "message":"Exception while executing SOLR search",
   "thrown":{
      "commonElementCount":0,
      "localizedMessage":"Cannot invoke \"de.hybris.platform.adaptivesearch.strategies.AsGroupMergeStrategy.mergeGroup(de.hybris.platform.adaptivesearch.data.AsSearchProfileResult, de.hybris.platform.adaptivesearch.data.AsSearchProfileResult)\" because \"groupMergeStrategy\" is null",
      "message":"Cannot invoke \"de.hybris.platform.adaptivesearch.strategies.AsGroupMergeStrategy.mergeGroup(de.hybris.platform.adaptivesearch.data.AsSearchProfileResult, de.hybris.platform.adaptivesearch.data.AsSearchProfileResult)\" because \"groupMergeStrategy\" is null",
      "name":"de.hybris.platform.solrfacetsearch.search.FacetSearchException",
      "cause":{
         "commonElementCount":159,
         "localizedMessage":"Cannot invoke \"de.hybris.platform.adaptivesearch.strategies.AsGroupMergeStrategy.mergeGroup(de.hybris.platform.adaptivesearch.data.AsSearchProfileResult, de.hybris.platform.adaptivesearch.data.AsSearchProfileResult)\" because \"groupMergeStrategy\" is null",
         "message":"Cannot invoke \"de.hybris.platform.adaptivesearch.strategies.AsGroupMergeStrategy.mergeGroup(de.hybris.platform.adaptivesearch.data.AsSearchProfileResult, de.hybris.platform.adaptivesearch.data.AsSearchProfileResult)\" because \"groupMergeStrategy\" is null",
         "name":"java.lang.NullPointerException",
   ...

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