pom.xml

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-mongodb-reactive</artifactId>
            <version>2.0.0.M6</version>
        </dependency>

        <dependency>
            <groupId>io.reactivex.rxjava2</groupId>
            <artifactId>rxjava</artifactId>
            <version>2.1.1</version>
        </dependency>

        <dependency>
            <groupId>io.reactivex</groupId>
            <artifactId>rxjava-reactive-streams</artifactId>
            <version>1.2.0</version>
        </dependency>

        <dependency>
            <groupId>de.flapdoodle.embed</groupId>
            <artifactId>de.flapdoodle.embed.mongo</artifactId>
            <version>2.0.0</version>
            <scope>runtime</scope>
        </dependency>