Get Reindex Status

{  "all_memory_ids": [    "string"  ],  "count_needing_reindex": 0,  "has_memories_needing_reindex": true,  "sample_memories": [    {      "id": "string",      "last_reindexed_at": "string",      "title": "string",      "updated_at": "string"    }  ]}