private Provider buildLocalProvider(ChainSpecification specWithoutInnerSearchers,
                                        ProviderReader providerReader,
                                        FederationOptions federationOptions) {
        try {
            return new LocalProvider(specWithoutInnerSearchers,
                                     federationOptions,
                                     new LocalProviderSpec(providerReader.clusterName));
        } catch (Exception e) {
            throw new RuntimeException("Failed creating local provider " + specWithoutInnerSearchers.componentId, e);
        }
    }
Retrieves all possible provider specific parameters
config-model/src/main/java/com/yahoo/vespa/model/builder/xml/dom/chains/search/DomProviderBuilder.java