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/**
* Tests that the 'ns' field in index specs is removed during metadata changes when in FCV 4.4.
*
* Starting in 4.4, the 'ns' field for index specs is no longer generated. We want to ensure that
* index specs created in prior server versions have their 'ns' field removed when running in FCV
* 4.4.
*/
(function() {
'use strict';
load('jstests/libs/feature_compatibility_version.js');
const dbName = 'test';
const collName = 'coll';
const dbpath = MongoRunner.dataPath + 'remove_ns_field_in_index_spec';
resetDbpath(dbpath);
const mongodOptions42 =
Object.extend({binVersion: 'last-stable'}, {dbpath: dbpath, cleanData: false});
const mongodOptions44 = Object.extend({binVersion: 'latest'}, {dbpath: dbpath, cleanData: false});
/**
* Start up with the 4.2 binary and create a collection. The default '_id' index should have the
* 'ns' field present in its index spec.
*/
let conn = MongoRunner.runMongod(mongodOptions42);
assert.neq(null, conn, 'mongod was unable to start with version ' + tojson(mongodOptions42));
let testDb = conn.getDB(dbName);
assert.commandWorked(testDb.adminCommand({setFeatureCompatibilityVersion: lastStableFCV}));
assert.commandWorked(testDb.createCollection(collName));
let coll = testDb.getCollection(collName);
let indexes = coll.getIndexes();
assert.eq(1, indexes.length);
assert.eq(dbName + '.' + collName, indexes[0].ns);
MongoRunner.stopMongod(conn);
/**
* Restart with the 4.4 binary while in FCV 4.2. The index should not lose its 'ns' field when doing
* a disk modifying metadata change.
*/
let restartOpts44 = Object.extend(mongodOptions44, {restart: true});
conn = MongoRunner.runMongod(restartOpts44);
assert.neq(null, conn, 'mongod was unable to start with version ' + tojson(restartOpts44));
testDb = conn.getDB(dbName);
coll = testDb.getCollection(collName);
// Run a metadata changing operation.
assert.commandWorked(coll.createIndex({x: 1}));
assert.commandWorked(coll.dropIndex({x: 1}));
indexes = coll.getIndexes();
assert.eq(1, indexes.length);
assert.eq(dbName + '.' + collName, indexes[0].ns);
/**
* Set the FCV to 4.4. The index should lose its 'ns' field when doing a disk modifying metadata
* change.
*/
assert.commandWorked(testDb.adminCommand({setFeatureCompatibilityVersion: latestFCV}));
// Run a metadata changing operation.
assert.commandWorked(coll.createIndex({x: 1}));
assert.commandWorked(coll.dropIndex({x: 1}));
indexes = coll.getIndexes();
assert.eq(1, indexes.length);
assert.eq(false, indexes[0].hasOwnProperty('ns'));
MongoRunner.stopMongod(conn);
})();
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