Apollo Federation Gateway Unknown Directive error @search

Issues GraphQL
5

Load the following schema into dgraph. I am using the v21.03.0 docker container running locally

type Equipment @key(fields: "id") {
  id: ID!
  name:String!
  events:[Event]
}
type Event @key(fields: "id") {
  id:ID!
  name:String
  timestamp:DateTime @search
  value:String
}

Then, using the following index.js for the graphql gateway, start the gateway with node index.js

const { ApolloServer } = require('apollo-server');
const { ApolloGateway } = require("@apollo/gateway");

const gateway = new ApolloGateway({
    serviceList: [
        { name: 'core', url: 'http://localhost:8080/graphql' }
    ],
});

const server = new ApolloServer({
    gateway,

    subscriptions: false,
});

server.listen().then(({ url }) => {
    console.log(`🚀 Server ready at ${url}`);
});

I get the following error

GraphQLSchemaValidationError: Unknown directive "search".
    at ApolloGateway.createSchema (/Users/geoffreynunan/Documents/GitHub/Libre-server/node_modules/@apollo/gateway/dist/index.js:207:19)
    at ApolloGateway.<anonymous> (/Users/geoffreynunan/Documents/GitHub/Libre-server/node_modules/@apollo/gateway/dist/index.js:178:32)
    at Generator.next (<anonymous>)
    at fulfilled (/Users/geoffreynunan/Documents/GitHub/Libre-server/node_modules/@apollo/gateway/dist/index.js:5:58)
    at processTicksAndRejections (node:internal/process/task_queues:94:5) {
  errors: [
    GraphQLError: Unknown directive "search".
        at Object.Directive (/Users/geoffreynunan/Documents/GitHub/Libre-server/node_modules/graphql/validation/rules/KnownDirectives.js:61:29)
        at Object.enter (/Users/geoffreynunan/Documents/GitHub/Libre-server/node_modules/graphql/language/visitor.js:324:29)
        at visit (/Users/geoffreynunan/Documents/GitHub/Libre-server/node_modules/graphql/language/visitor.js:242:26)
        at Object.validateSDL (/Users/geoffreynunan/Documents/GitHub/Libre-server/node_modules/graphql/validation/validate.js:93:22)
        at buildSchemaFromDefinitionsAndExtensions (/Users/geoffreynunan/Documents/GitHub/Libre-server/node_modules/@apollo/federation/dist/composition/compose.js:150:25)
        at Object.composeServices (/Users/geoffreynunan/Documents/GitHub/Libre-server/node_modules/@apollo/federation/dist/composition/compose.js:221:30)
        at Object.composeAndValidate (/Users/geoffreynunan/Documents/GitHub/Libre-server/node_modules/@apollo/federation/dist/composition/composeAndValidate.js:13:41)
        at ApolloGateway.createSchema (/Users/geoffreynunan/Documents/GitHub/Libre-server/node_modules/@apollo/gateway/dist/index.js:199:49)
        at ApolloGateway.<anonymous> (/Users/geoffreynunan/Documents/GitHub/Libre-server/node_modules/@apollo/gateway/dist/index.js:178:32)
        at Generator.next (<anonymous>) {
      locations: [ { line: 15, column: 22 } ]
    }
  ]
}

If I remove the @search directive from the dgraph schema, the gateway starts successfully