chore: update README.md

Author: actions-user

README.md

@@ -208,6 +208,7 @@ Available targets:
 | <a name="input_ebs_throughput"></a> [ebs\_throughput](#input\_ebs\_throughput) | Specifies the throughput (in MiB/s) of the EBS volumes attached to data nodes. Applicable only for the gp3 volume type. Valid values are between 125 and 1000. | `number` | `null` | no |
 | <a name="input_ebs_volume_size"></a> [ebs\_volume\_size](#input\_ebs\_volume\_size) | EBS volumes for data storage in GB | `number` | `0` | no |
 | <a name="input_ebs_volume_type"></a> [ebs\_volume\_type](#input\_ebs\_volume\_type) | Storage type of EBS volumes | `string` | `"gp2"` | no |
+| <a name="input_elasticsearch_domain_name"></a> [elasticsearch\_domain\_name](#input\_elasticsearch\_domain\_name) | The name of the Elasticsearch domain. Must be at least 3 and no more than 28 characters long. Valid characters are a-z (lowercase letters), 0-9, and - (hyphen). | `string` | `""` | no |
 | <a name="input_elasticsearch_subdomain_name"></a> [elasticsearch\_subdomain\_name](#input\_elasticsearch\_subdomain\_name) | The name of the subdomain for Elasticsearch in the DNS zone (\_e.g.\_ `elasticsearch`, `ui`, `ui-es`, `search-ui`) | `string` | `""` | no |
 | <a name="input_elasticsearch_version"></a> [elasticsearch\_version](#input\_elasticsearch\_version) | Version of Elasticsearch to deploy (\_e.g.\_ `7.4`, `7.1`, `6.8`, `6.7`, `6.5`, `6.4`, `6.3`, `6.2`, `6.0`, `5.6`, `5.5`, `5.3`, `5.1`, `2.3`, `1.5` | `string` | `"7.4"` | no |
 | <a name="input_enabled"></a> [enabled](#input\_enabled) | Set to false to prevent the module from creating any resources | `bool` | `null` | no |