final long start = System.currentTimeMillis();

        final SuggestDeleteResponse deleteResponse =
                deleteByQuery(QueryBuilders.boolQuery().must(QueryBuilders.rangeQuery(FieldNames.DOC_FREQ).gte(1))
                        .mustNot(QueryBuilders.matchPhraseQuery(FieldNames.KINDS, SuggestItem.Kind.QUERY.toString()))

    }

    public long getDocumentWordsNum() {
        return getNum(QueryBuilders.rangeQuery(FieldNames.DOC_FREQ).gte(1));
    }

    public long getQueryWordsNum() {
        return getNum(QueryBuilders.rangeQuery(FieldNames.QUERY_FREQ).gte(1));
    }

    private long getNum(final QueryBuilder queryBuilder) {

            final String from = LocalDateTime.now().minusDays(fessConfig.getPurgeSuggestSearchLogDay()).format(DateTimeFormatter.ISO_DATE);
            cb.query().addQuery(QueryBuilders.rangeQuery("requestedAt").gte(from));
            cb.query().addOrderBy_RequestedAt_Asc();
            cb.specify().columnAccessType();
            cb.specify().columnUserSessionId();
            cb.specify().columnHitCount();

        assertObjectNotNull("ck", ck);
        if (ck.equals(ConditionKey.CK_GREATER_THAN)) {
            builder.gt(value);
        } else if (ck.equals(ConditionKey.CK_GREATER_EQUAL)) {
            builder.gte(value);
        } else if (ck.equals(ConditionKey.CK_LESS_THAN)) {
            builder.lt(value);
        } else if (ck.equals(ConditionKey.CK_LESS_EQUAL)) {
            builder.lte(value);
        }
    }

        assertObjectNotNull("ck", ck);
        if (ck.equals(ConditionKey.CK_GREATER_THAN)) {
            builder.gt(value);
        } else if (ck.equals(ConditionKey.CK_GREATER_EQUAL)) {
            builder.gte(value);
        } else if (ck.equals(ConditionKey.CK_LESS_THAN)) {
            builder.lt(value);
        } else if (ck.equals(ConditionKey.CK_LESS_EQUAL)) {
            builder.lte(value);
        }
    }

        assertObjectNotNull("ck", ck);
        if (ck.equals(ConditionKey.CK_GREATER_THAN)) {
            builder.gt(value);
        } else if (ck.equals(ConditionKey.CK_GREATER_EQUAL)) {
            builder.gte(value);
        } else if (ck.equals(ConditionKey.CK_LESS_THAN)) {
            builder.lt(value);
        } else if (ck.equals(ConditionKey.CK_LESS_EQUAL)) {
            builder.lte(value);
        }
    }