Update default values for Multichain search vars

Author: vbaranov

setup/env-variables/backend-envs-integrations.md

@@ -102,8 +102,8 @@ Multichain Search is the single point of search of the data in the all blockchai
 | ------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | -------------------------------------------------------------------------- |
 | `MICROSERVICE_MULTICHAIN_SEARCH_URL`              | Multichain Search Service API URL. Integration is enabled, if this variable value contains valid URL. Implemented in [#11139](https://github.com/blockscout/blockscout/pull/11139) | <p>Version: v6.10.0+<br>Default: (empty)<br>Applications: API, Indexer</p> |
 | `MICROSERVICE_MULTICHAIN_SEARCH_API_KEY`          | Multichain Search Service API key. Implemented in [#11139](https://github.com/blockscout/blockscout/pull/11139)                                                                    | <p>Version: v6.10.0+<br>Default: (empty)<br>Applications: API, Indexer</p> |
-| `MICROSERVICE_MULTICHAIN_SEARCH_ADDRESSES_CHUNK_SIZE`          | Chunk size of addresses while exporting to Multichain Search DB. Implemented in [#12377](https://github.com/blockscout/blockscout/pull/12377)                                                                    | <p>Version: v8.1.0+<br>Default: (empty)<br>Applications: API, Indexer</p> |
-| `MIGRATION_BACKFILL_MULTICHAIN_SEARCH_BATCH_SIZE` | Batch size of backfilling Multichain Search Service DB. Implemented in [#11139](https://github.com/blockscout/blockscout/pull/11139)                                               | <p>Version: v6.10.0+<br>Default: (empty)<br>Applications: Indexer</p>      |
+| `MICROSERVICE_MULTICHAIN_SEARCH_ADDRESSES_CHUNK_SIZE`          | Chunk size of addresses while exporting to Multichain Search DB. Implemented in [#12377](https://github.com/blockscout/blockscout/pull/12377)                                                                    | <p>Version: v8.1.0+<br>Default: 7000<br>Applications: API, Indexer</p> |
+| `MIGRATION_BACKFILL_MULTICHAIN_SEARCH_BATCH_SIZE` | Batch size of backfilling Multichain Search Service DB. Implemented in [#11139](https://github.com/blockscout/blockscout/pull/11139)                                               | <p>Version: v6.10.0+<br>Default: 10<br>Applications: Indexer</p>      |
 | `INDEXER_DISABLE_MULTICHAIN_SEARCH_DB_EXPORT_RETRY_FETCHER`             | If `true`, `retry` multichain search export fetcher doesn't run. Implemented in [#12377](https://github.com/blockscout/blockscout/pull/12377).                  | <p>Version: v8.1.0+<br>Default: <code>false</code><br>Applications: Indexer</p>                                      |
 | `INDEXER_MULTICHAIN_SEARCH_DB_EXPORT_RETRY_BATCH_SIZE`                                 | Batch size for `retry` multichain search export fetcher. Implemented in [#12377](https://github.com/blockscout/blockscout/pull/12377).                       | <p>Version: v8.1.0+<br>Default: <code>10</code><br>Applications: Indexer</p>                                        |
 | `INDEXER_MULTICHAIN_SEARCH_DB_EXPORT_RETRY_CONCURRENCY`                                | Concurrency for `retry` multichain search export fetcher. Implemented in [#12377](https://github.com/blockscout/blockscout/pull/12377).     | <p>Version: v8.1.0+<br>Default: <code>10</code><br>Applications: Indexer</p>                                         |