/**
 * Escapes special Lucene characters in a query string.
 *
 * Symbol-form operators escaped:
 *   + - && || ! ( ) { } [ ] ^ " ~ * ? : \ /
 *
 * Bareword booleans (`AND`, `OR`, `NOT`, `TO`) are also neutralised. Pre-
 * 1.7.3 they survived sanitisation, letting an attacker inject a boolean
 * query (e.g. `foo AND _exists_:adminFlag`) even after symbol escaping.
 * The standard Lucene analyser lowercases tokens during indexing, so
 * lowercasing the bareword turns it into a literal-word match — which
 * is what callers of `sanitizeLuceneQuery` expect (the function exists
 * to make untrusted user input safe to pass to Lucene). Range-modifier
 * boost/fuzzy (`^N`, `~N`) are already disarmed because `^` and `~`
 * get backslash-escaped in the symbol pass.
 */
export declare function sanitizeLuceneQuery(query: string): string;
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