return new UpdateRequest(fessConfig.getIndexDocumentUpdateIndex(), id).script(script)
                                                .upsert(upsertMap);
                                    }
                                    return null;
                                }).filter(req -> req != null).toArray(n -> new UpdateRequest[n]);

                                    Operation controls whether or not to update/add a tag, or to remove it.

                                    Valid Options: UPSERT, REMOVE
                                  enum:
                                  - UPSERT
                                  - REMOVE
                                  type: string
                                value:

### Step 1: Ensure postgresql minimum requirements are met

MinIO requires PostgreSQL version 9.5 or above. MinIO uses the [`INSERT ON CONFLICT`](https://www.postgresql.org/docs/9.5/static/sql-insert.html#SQL-ON-CONFLICT) (aka UPSERT) feature, introduced in version 9.5 and the [JSONB](https://www.postgresql.org/docs/9.4/static/datatype-json.html) data-type introduced in version 9.4.

### Step 2: Add PostgreSQL endpoint to MinIO