MAGE-938 Add cache clean up when deleting unused replica indices

Author: cammonro

Service/Product/ReplicaManager.php

@@ -436,6 +436,10 @@ public function deleteReplicasFromAlgolia(int $storeId, bool $unused = false): v
         }
 
         $this->deleteIndices($replicasToDelete);
+
+        if ($unused) {
+            $this->clearUnusedReplicaIndicesCache($storeId);
+        }
     }
 
     /**
@@ -474,6 +478,15 @@ public function getUnusedReplicaIndices(int $storeId): array
         return $this->_unusedReplicaIndices[$storeId];
     }
 
+    protected function clearUnusedReplicaIndicesCache(?int $storeId = null): void
+    {
+        if (is_null($storeId)) {
+            $this->_unusedReplicaIndices = [];
+        } else {
+            unset($this->_unusedReplicaIndices[$storeId]);
+        }
+    }
+
     /**
      * Get a list of all replica indices for all Magento managed stores
      * (This may be useful in case of cross store replica misconfiguration)