public String getFunctionDefinitionVersionId() {
        return this.functionDefinitionVersionId;
    }
The ID of the function definition version. This value maps to the ''Version'' property of the corresponding
''VersionInformation'' object, which is returned by ''ListFunctionDefinitionVersions'' requests. If the version
is the last one that was associated with a function definition, the value also maps to the ''LatestVersion''
property of the corresponding ''DefinitionInformation'' object.

@return The ID of the function definition version. This value maps to the ''Version'' property of the
        corresponding ''VersionInformation'' object, which is returned by ''ListFunctionDefinitionVersions''
        requests. If the version is the last one that was associated with a function definition, the value also
        maps to the ''LatestVersion'' property of the corresponding ''DefinitionInformation'' object.
aws-java-sdk-greengrass/src/main/java/com/amazonaws/services/greengrass/model/GetFunctionDefinitionVersionRequest.java