I am trying to change the text index setting, but the existing text index is not deleted.
Reproduce
A text index is created as shown below.
db.users.getIndexes()
[
{
"key": {
"_fts": "text",
"_ftsx": 1
},
"name": "search_terms_text",
"ns": "db.users",
"v": 2,
"default_language": "english",
"language_override": "language",
"textIndexVersion": 3,
"weights": {
"search_terms": 1
}
}
]
I did dropIndex with the index name as shown below, and got the result that it was successful.
db.users.dropIndex("search_terms_text")
[
{
"$clusterTime": {
"clusterTime": {"$timestamp": {"t": 1645773616, "i": 473}},
"signature": {
"hash": {"$binary": {"base64": "CH0lkqS6u83NeFP5Xd3y3NDVJKw=", "subType": "00"}},
"keyId": 7014029826021392388
}
},
"nIndexesWas": 2,
"ok": 1,
"operationTime": {"$timestamp": {"t": 1645773616, "i": 473}}
}
]
When I try to re-create the text index after deletion, I get an error message stating that it already exists as shown below.
db.users.createIndex(
{ search_terms: "text" },
{ default_language: "none" }
)
Command failed with error 85 (IndexOptionsConflict): 'Index with name: search_terms_text already exists with different options' on server ***. The full response is {"operationTime": {"$timestamp": {"t": 1645773721, "i": 183}}, "ok": 0.0, "errmsg": "Index with name: search_terms_text already exists with different options", "code": 85, "codeName": "IndexOptionsConflict", "$clusterTime": {"clusterTime": {"$timestamp": {"t": 1645773721, "i": 183}}, "signature": {"hash": {"$binary": {"base64": "njwxfSeASmTReFUzs/tZFBJv34k=", "subType": "00"}}, "keyId": 7014029826021392388}}}
When I call getIndexes() again, I could see that the text index was not deleted and remained.
db.users.getIndexes()
[
{
"key": {
"_fts": "text",
"_ftsx": 1
},
"name": "search_terms_text",
"ns": "db.users",
"v": 2,
"default_language": "english",
"language_override": "language",
"textIndexVersion": 3,
"weights": {
"search_terms": 1
}
}
]
DB Logs
When I check the DB log in that time period, it is as follows.
1. index build: done building index search_terms_text on ns db.users
2. Deferring table drop for index 'search_terms_text' on collection 'db.users.$search_terms_text (8082e0dc-6416-43f1-97a6-26101033e5ea)'. Ident: 'db/index-183-7199585454386394577', commit timestamp: 'Timestamp(1645773616, 473)'
3. index build: inserted 551 keys from external sorter into index in 0 seconds
4. index build: collection scan done. scanned 17 total records in 0 seconds
5. index build: starting on db.users properties: { v: 2, key: { _fts: "text", _ftsx: 1 }, name: "search_terms_text", ns: "db.users", weights: { search_terms: 1 }, default_language: "english", language_override: "language", textIndexVersion: 3 } using method: Hybrid
6. Completing drop for ident db/index-183-7199585454386394577 (ns: db.users.$search_terms_text) with drop timestamp Timestamp(1645773616, 473)
Environment
mongodb version: 4.2.12
replica set: primary 1, secondary 2
Question
- Why do text indexes keep regenerating?
- If I can’t drop the text index, is there a way to change the default_language setting?
Thanks to everyone who replied.
!
!