Lowercase​

The lowercase filter converts terms generated by a tokenizer to lowercase, making searches case-insensitive. For example, it can convert ["High", "Performance", "Vector", "Database"] to ["high", "performance", "vector", "database"].​

Configuration​

The lowercase filter is built into Milvus. To use it, simply specify its name in the filter section within analyzer_params.​

analyzer_params = {​
    "tokenizer": "standard",​
    "filter": ["lowercase"],​
}​

The lowercase filter operates on the terms generated by the tokenizer, so it must be used in combination with a tokenizer.

After defining analyzer_params, you can apply them to a VARCHAR field when defining a collection schema. This allows Milvus to process the text in that field using the specified analyzer for efficient tokenization and filtering. For details, refer to Example use.​

Example output​

Here’s an example of how the lowercase filter processes text:​

Original text:​

"The Lowercase Filter Ensures Uniformity In Text Processing."​

Expected output:​

["the", "lowercase", "filter", "ensures", "uniformity", "in", "text", "processing"]​