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In JSON Object field the presence of term frequencies depend on the field. Typically, a string with postiions indexed will have positions while numbers won't. The presence or absence of term freqs for a given term is unfortunately encoded in a very passive way. It is given by the presence of extra information in the skip info, or the lack of term freqs after decoding vint blocks. Before, after writing a segment, we would encode the segment correctly (without any term freq for number in json object field). However during merge, we would get the default term freq=1 value. (this is default in the absence of encoded term freqs) The merger would then proceed and attempt to decode 1 position when there are in fact none. This PR requires to explictly tell the posting serialize whether term frequencies should be serialized for each new term. Closes #2251