Description:

I couldn't find any documentation about these two limits. But if there are any, we should remove them.

Engineering Ticket Description:

SERVER-8431 restricted inserting a document into a collection with a text index under the following circumstances:

• The number of unique terms in the fields indexed by the text index is greater than 400,000.
• The total size of those terms is greater than 4MB.

This was done to avoid causing the server to shut down from generating a group commit larger than 512MB. However, we have since increased the journaling capacity limit to 2000MB as part of SERVER-17501. We should considering raising these limits to allows users to store more text data in a single document.

Steps to reproduce

db.foo.drop();
db.foo.createIndex({a: 'text'});

var termLength = 16;

var str = '';
for (var i = 0; i < (5 * 1024 * 1024 / termLength); i++) {
    if (i > 0) {
        str += ' ';
    }
    str += i.zeroPad(termLength);
}

assert.writeOK(db.foo.insert({a: str}));

assert: write failed with error: {
    "nInserted" : 0,
    "writeError" : {
        "code" : 16733,
        "errmsg" : "trying to index text where term list is too big, max is 4mb _id: ObjectId('568d68d5dd2e24af1002e247')"
    }
}
_getErrorWithCode@src/mongo/shell/utils.js:23:13
doassert@src/mongo/shell/assert.js:13:14
assert.writeOK@src/mongo/shell/assert.js:414:9