adding analyzers to Azure Search Index using REST API not saving - azure

Question

Having trouble getting the analyzers to save / update on the index. When creating, everything else (the tokenFilters, tokenizers, fields) saves fine, but the analyzers array is always empty?
await client.createOrUpdateIndex(index, { allowIndexDowntime: true });
Creating a new index:
let index = {
name: "test-index",
tokenizers: [{
"odatatype": "#Microsoft.Azure.Search.StandardTokenizerV2",
"name": "test_standard_v2",
"maxTokenLength": 255
}],
fields: [{
"name": "metadata_storage_path",
"type": "Edm.String",
"facetable": false,
"filterable": false,
"key": true,
"retrievable": true,
"searchable": false,
"sortable": false,
"analyzer": null,
"indexAnalyzer": null,
"searchAnalyzer": null,
"synonymMaps": [],
"fields": []
}, {
'name': 'metadata_storage_name',
'type': 'Edm.String',
'facetable': false,
'filterable': false,
'key': false,
'retrievable': true,
'searchable': true,
'sortable': false,
'synonymMaps': [],
'fields': [],
},
{
"name": "partialName",
"type": "Edm.String",
"retrievable": false,
"searchable": true,
"filterable": false,
"sortable": false,
"facetable": false,
"key": false,
"searchAnalyzer": "standardCmAnalyzer",
"indexAnalyzer": "filename_analyzer"
}],
tokenFilters: [{
"name": "nGramCmTokenFilter",
"odatatype": "#Microsoft.Azure.Search.NGramTokenFilterV2",
"minGram": 3,
"maxGram": 20
}],
analyzers: [{
"name": "standardCmAnalyzer",
"odatatype": "#Microsoft.Azure.Search.CustomAnalyzer",
"tokenizer": "test_standard_v2",
"tokenFilters": ["lowercase", "asciifolding"]
},
{
"name": "filename_analyzer",
"odatatype": "#Microsoft.Azure.Search.CustomAnalyzer",
"tokenizer": "test_standard_v2",
"tokenFilters": [
"nGramCmTokenFilter"
]
}],
};
Then creating it:
await client.createOrUpdateIndex(index, { allowIndexDowntime: true });
I noticed no error messages being returned.
EDIT:
Using the sdk #azure/search-documents ^11.1.0