Mappings Issue

[Dasher (Deepak)]

Hi,
I have a field in my index with the mapping and custom analyzer has followed:
Mapping:
"BookingNo" : {
"type" : "text",
"fields" : {
"lowercase_keyword" : {
"type" : "text",
"analyzer" : "lowercase_keyword_analyzer"
}
}
}
custom analyzer:
"analysis" : {
"analyzer" : {
"lowercase_keyword_analyzer" : {
"filter" : [
"lowercase"
],
"type" : "custom",
"tokenizer" : "keyword"
}
}
}
When i try to search whether the field exist in the document using the query

GET index-name/_search
{
"query": {
"bool": {
"must": {
"exists": {
"field": "BookingNo.lowercase_keyword"
}
}
}
}
}

It returns around 1500 document but when i check those documents the field doesn't exist
What could be the reason for it?

[warkolm (Mark Walkom)]

Please format your code/logs/config using the </> button, or markdown style back ticks. It helps to make things easy to read which helps us help you

It'd be useful if you shared an example document that is being returned that doesn't have the field.