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| 1 | +# .NET Driver Version 3.1.0 Release Notes |
| 2 | + |
| 3 | +This is the general availability release for the 3.1.0 version of the driver. |
| 4 | + |
| 5 | +The main new features in 3.1.0 include: |
| 6 | + |
| 7 | ++ Support token field type and array field expressions with Atlas Search builders for equals operator - [CSHARP-4926](https://jira.mongodb.org/browse/CSHARP-4926) |
| 8 | ++ Support `SearchIndexType` option when creating Atlas Search indexes - [CSHARP-4960](https://jira.mongodb.org/browse/CSHARP-4960) |
| 9 | ++ Support for valid SRV hostnames with less than 3 parts - [CSHARP-5200](https://jira.mongodb.org/browse/CSHARP-5200) |
| 10 | ++ Support for search sequential pagination - [CSHARP-5420](https://jira.mongodb.org/browse/CSHARP-5420) |
| 11 | ++ Support for Mql methods: `Exists`, `IsMissing` and `IsNullOrMissing` in filters when possible - [CSHARP-5427](https://jira.mongodb.org/browse/CSHARP-5427) |
| 12 | ++ Support for Exact Vector Search (ENN) - [CSHARP-5212](https://jira.mongodb.org/browse/CSHARP-5212) |
| 13 | ++ Allow sort option to be supplied to update commands (updateOne, etc.) - [CSHARP-5201](https://jira.mongodb.org/browse/CSHARP-5201) |
| 14 | ++ Disabled TLS renegotiation when possible - [CSHARP-2843](https://jira.mongodb.org/browse/CSHARP-2843) |
| 15 | ++ Fix a bug in discriminator convention inheritance - [CSHARP-5349](https://jira.mongodb.org/browse/CSHARP-5349) |
| 16 | ++ New Serializers for ImmutableArray and other immutable collections - [CSHARP-5335](https://jira.mongodb.org/browse/CSHARP-5335) |
| 17 | ++ Minor bug fixes and improvements. |
| 18 | + |
| 19 | +The full list of issues resolved in this release is available at [CSHARP JIRA project](https://jira.mongodb.org/issues/?jql=project%20%3D%20CSHARP%20AND%20fixVersion%20%3D%203.1.0%20ORDER%20BY%20key%20ASC). |
| 20 | + |
| 21 | +Documentation on the .NET driver can be found [here](https://www.mongodb.com/docs/drivers/csharp/v3.1/). |
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