Add material ID query to elasticity (#881)

* Fix elasticity query_ops

* Remove elasticity sub key in summary

* Fix elasticity tests

* Linting

* Fix elasticity import

* Fix nested elasticity data in summary

* More nested summary fixes

* Linting

* Add multi material_id query to elasticity

emmet-api/emmet/api/routes/materials/elasticity/resources.py

@@ -2,6 +2,7 @@
 from emmet.core.elasticity import ElasticityDoc
 from emmet.api.core.global_header import GlobalHeaderProcessor
 from maggma.api.query_operator import PaginationQuery, SortQuery, SparseFieldsQuery
+from emmet.api.routes.materials.materials.query_operators import MultiMaterialIDQuery
 from emmet.api.routes.materials.elasticity.query_operators import (
     ElasticityChemsysQuery,
     BulkModulusQuery,
@@ -17,6 +18,7 @@ def elasticity_resource(elasticity_store):
         elasticity_store,
         ElasticityDoc,
         query_operators=[
+            MultiMaterialIDQuery(),
             ElasticityChemsysQuery(),
             BulkModulusQuery(),
             ShearModulusQuery(),