@Override
    public void initialize(Map<String, Param> params) throws TikaConfigException {
        if (StringUtils.isBlank(openSearchUrl)) {
            throw new TikaConfigException("Must specify an open search url!");
        } else {
            openSearchClient =
                    new OpenSearchClient(openSearchUrl,
                            httpClientFactory.build());
        }
    }
This prefixes the keys before sending them to OpenSearch.
For example, "pdfinfo_", would have this reporter sending
"pdfinfo_status" and "pdfinfo_parse_time" to OpenSearch.
@param keyPrefix
tika-pipes/tika-pipes-reporters/tika-pipes-reporter-opensearch/src/main/java/org/apache/tika/pipes/reporters/opensearch/OpenSearchPipesReporter.java