Conditional Elastic Search Filter for Fuzzy Search in NEST - elasticsearch

Question

I have a working query against my index however I am having difficulty getting a conditional filter working.
The query I have working is as follows:
var firstSearchResponse = client.Search<IndexedUser>(s => s
.Query(q =>
(q
.Match(m => m
.Field(f => f.FirstName)
.Query(term)
.Fuzziness(Fuzziness.EditDistance(2))
)
||
q.Match(m => m
.Field(f => f.LastName)
.Query(term)
.Fuzziness(Fuzziness.EditDistance(2))
))
&&
(
q.Match(m => m
.Field(f => f.IsSearchable)
.Query("true")
)
)
);
However now I would like to say that if a user passes in a city, or a state, or both, then filter on each of those fields to only return those results.
As an example, if I pass in a city of New York, then only filter those results.
How can I do this?
I tried using PostFilter but it doesn't seem to work when I pass in input:
var filters = new List<Func<QueryContainerDescriptor<IndexedUser>, QueryContainer>>();
//If city was provided, then search on that
if (!String.IsNullOrEmpty(city))
filters.Add(fq => fq.Terms(t => t.Field(f => f.City).Terms(city)));
//If state was provided, then search on that
if (!String.IsNullOrEmpty(state))
filters.Add(fq => fq.Terms(t => t.Field(f => f.State).Terms(state)));
and then at the end of my query, adding this:
var firstSearchResponse = client.Search<IndexedUser>(s => s
.Query(q =>
(q
.Match(m => m
.Field(f => f.FirstName)
.Query(term)
.Fuzziness(Fuzziness.EditDistance(2))
)
||
q.Match(m => m
.Field(f => f.LastName)
.Query(term)
.Fuzziness(Fuzziness.EditDistance(2))
))
&&
(
q.Match(m => m
.Field(f => f.IsSearchable)
.Query("true")
)
)
).PostFilter(p => p.Bool(q => q.Filter(filters))));
..if I add the PostFilter, it works unless I actually pass in a value for city or state.
Am I misusing PostFilter, or is there a logic flaw above?
Thanks you so much for any help/guidance!