[ML] Data frame analytics explain API errors if includes field contains a comma #72541
Description
The data frame analytics _explain API throws an error if one of the includes or excludes fields contains a comma , character.
For example, using the special_characters_2019 dataset, running
POST _ml/data_frame/analytics/_explain
{
"description":"",
"source":{
"index":"special_characters_2019",
"query":{
"match_all":{
}
}
},
"analyzed_fields":{
"includes":[
"ampersand&name",
"asterisk*name",
"at@name",
"colon:name",
"comma,name"
]
},
"analysis":{
"regression":{
"dependent_variable":"metric%$£&!{(]field",
"num_top_feature_importance_values":0,
"training_percent":80
}
},
"max_num_threads":1
}
Gives an error:
{
"error" : {
"root_cause" : [
{
"type" : "status_exception",
"reason" : "No field [comma] could be detected"
}
],
"type" : "status_exception",
"reason" : "No field [comma] could be detected"
},
"status" : 400
}