No results with is_final true for single utterance set to true

[vaibhav_jio]

I am using below configuration to identify my voice input stream (Hindi language)  :

config.set_language_code("hi-IN");

config.set_sample_rate_hertz(8000);

config.set_encoding(RecognitionConfig::LINEAR16);

config.set_model("command_and_search");

streaming_config.set_single_utterance(true);

streaming_config.set_interim_results(true);

After setting single utterance to true I am not getting any results with is_final as "True" in the sample application : https://github.com/GoogleCloudPlatform/cpp-samples/blob/main/speech/api/streaming_transcribe.cc 

for (auto response = read(); response.has_value(); response = read()) {

// Dump the transcript of all the results.

std::cout<<"Printing speech - event type = "<<response->speech_event_type()<<std::endl;

for (auto const& result : response->results()) {

std::cout<<"Is final = "<<result.is_final()<<std::endl;

for (auto const& alternative : result.alternatives()) {

if(!result.is_final())

{

std::cout<<"Interim results ==-========="<<"\t";

std::cout //<< alternative.confidence() << "\t"

<< alternative.transcript() << "\n";

}

else

{

std::cout<<"is_final has returned true"<<"\t";

std::cout //<< alternative.confidence() << "\t"

<< alternative.transcript() << "\n";

}

std::cout<<"Printing speech - event type = "<<response->speech_event_type()<<std::endl;

}

}

}

For Hindi inputs like single words :  इस,  21(इक्कीस)

I never get a response with is_final set to true even after getting  response->speech_event_type() as '1' (END_OF_SINGLE_UTTERANCE)