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 Zilliz Cloud. To use it, simply specify its name in the filter section within analyzer_params.

Python

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

Java

Map<String, Object> analyzerParams = new HashMap<>();
analyzerParams.put("tokenizer", "standard");
analyzerParams.put("filter", Collections.singletonList("lowercase"));

NodeJS

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

Go

analyzerParams = map[string]any{"tokenizer": "standard", "filter": []any{"lowercase"}}

cURL

# restful
analyzerParams='{
  "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. For a list of tokenizers available in Zilliz Cloud, refer to Tokenizer Reference.

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

Examples

Analyzer configuration

Python

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

Java

Map<String, Object> analyzerParams = new HashMap<>();
analyzerParams.put("tokenizer", "standard");
analyzerParams.put("filter", Collections.singletonList("lowercase"));

NodeJS

// javascript

Go

analyzerParams := map[string]any{"tokenizer": "standard", "filter": []any{"lowercase"}}

cURL

# restful

Expected output

['the', 'lowercase', 'filter', 'ensures', 'uniformity', 'in', 'text', 'processing']