Issue #3236773: Missing config schema

config/schema/search_api_solr.suggester.schema.yml

+plugin.plugin_configuration.search_api_autocomplete_suggester.search_api_solr_suggester:
+  type: mapping
+  label: 'Search API Solr Suggester'
+  mapping:
+    search_api_solr/site_hash:
+      type: integer
+      label: 'Site hash'
+    search_api/index:
+      type: string
+      label: 'Index ID'
+    drupal/langcode:
+      type: string
+      label: 'Language'
+
+plugin.plugin_configuration.search_api_autocomplete_suggester.search_api_solr_spellcheck:
+  type: mapping
+  label: 'Search API Solr Spellcheck'
+
+plugin.plugin_configuration.search_api_autocomplete_suggester.search_api_solr_terms:
+  type: plugin.plugin_configuration.search_api_autocomplete_suggester.server
+  label: 'Search API Solr Terms'