Examples of org.elasticsearch.common.lucene.search.RegexpFilter.flags()

        Filter filter = ((FilteredQuery) parsedQuery.query()).getFilter();
        assertThat(filter, instanceOf(RegexpFilter.class));
        RegexpFilter regexpFilter = (RegexpFilter) filter;
        assertThat(regexpFilter.field(), equalTo("name.first"));
        assertThat(regexpFilter.regexp(), equalTo("s.*y"));
        assertThat(regexpFilter.flags(), equalTo(INTERSECTION.value() | COMPLEMENT.value() | EMPTY.value()));
    }


    @Test
    public void testNamedAndCachedRegexpWithFlagsFilteredQuery() throws IOException {
        IndexQueryParserService queryParser = queryParser();

        assertThat(new BytesRef(wrapper.cacheKey().bytes()).utf8ToString(), equalTo("key"));
        assertThat(wrapper.wrappedFilter(), instanceOf(RegexpFilter.class));
        RegexpFilter regexpFilter = (RegexpFilter) wrapper.wrappedFilter();
        assertThat(regexpFilter.field(), equalTo("name.first"));
        assertThat(regexpFilter.regexp(), equalTo("s.*y"));
        assertThat(regexpFilter.flags(), equalTo(INTERSECTION.value() | COMPLEMENT.value() | EMPTY.value()));
    }


    @Test
    public void testRegexpBoostQuery() throws IOException {
        IndexQueryParserService queryParser = queryParser();

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