[Home](./index.md) > [kibana-plugin-plugins-expressions-server](./kibana-plugin-plugins-expressions-server.md) > [Executor](./kibana-plugin-plugins-expressions-server.executor.md) > [migrate](./kibana-plugin-plugins-expressions-server.executor.migrate.md) ## Executor.migrate() method Signature: ```typescript migrate(ast: SerializableState, version: string): ExpressionAstExpression; ``` ## Parameters | Parameter | Type | Description | | --- | --- | --- | | ast | SerializableState | | | version | string | | Returns: `ExpressionAstExpression`